Long COVID

Nearly one-third of adults over age 65 developed one or more new medical conditions in the weeks following a COVID-19 infection, according to new research.

The findings of the observational study, which were published in the BMJ, show the risk of a new condition being triggered by COVID is more than twice as high in seniors, compared with younger patients. Plus, the researchers observed an even higher risk among those who were hospitalized, with nearly half (46%) of patients having developed new conditions after the acute COVID-19 infection period.

Respiratory failure with shortness of breath was the most common postacute sequela, but a wide range of heart, kidney, lung, liver, cognitive, mental health, and other conditions were diagnosed at least 3 weeks after initial infection and persisted beyond 30 days.

This is one of the first studies to specifically describe the incidence and severity of new conditions triggered by COVID-19 infection in a general sample of older adults, said study author Ken Cohen MD, FACP, executive director of translational research at Optum Labs and national senior medical director at Optum Care.

“Much of what has been published on the postacute sequelae of COVID-19 has been predominantly from a younger population, and many of the patients had been hospitalized,” Dr. Cohen noted. “This was the first study to focus on a large population of seniors, most of whom did not require hospitalization.”

Dr. Cohen and colleagues reviewed the health insurance records of more than 133,000 Medicare beneficiaries aged 65 or older who were diagnosed with COVID-19 before April 2020. They also matched individuals by age, race, sex, hospitalization status, and other factors to comparison groups without COVID-19 (one from 2020 and one from 2019), and to a group diagnosed with other lower respiratory tract viral infections before the pandemic.
 

Risk of developing new conditions was higher in hospitalized

After acute COVID-19 infection, 32% of seniors sought medical care for at least one new medical condition in 2020, compared with 21% of uninfected people in the same year.

The most commonly observed conditions included:

• Respiratory failure (7.55% higher risk).
• Fatigue (5.66% higher risk).
• High blood pressure (4.43% higher risk).
• Memory problems (2.63% higher risk).
• Kidney injury (2.59% higher risk).
• Mental health diagnoses (2.5% higher risk).
• Blood-clotting disorders (1.47 % higher risk).
• Heart rhythm disorders (2.9% higher risk).

The risk of developing new conditions was even higher among those 23,486 who were hospitalized in 2020. Those individuals showed a 23.6% higher risk for developing at least one new condition, compared with uninfected seniors in the same year. Also, patients older than 75 had a higher risk for neurological disorders, including dementia, encephalopathy, and memory problems. The researchers also found that respiratory failure and kidney injury were significantly more likely to affect men and Black patients.

When those who had COVID were compared with the group with other lower respiratory viral infections before the pandemic, only the risks of respiratory failure (2.39% higher), dementia (0.71% higher), and fatigue (0.18% higher) were higher.

Primary care providers can learn from these data to better evaluate and manage their geriatric patients with COVID-19 infection, said Amit Shah, MD, a geriatrician with the Mayo Clinic in Phoenix, in an interview.

“We must assess older patients who have had COVID-19 for more than just improvement from the respiratory symptoms of COVID-19 in post-COVID follow-up visits,” he said. “Older individuals with frailty have vulnerability to subsequent complications from severe illnesses and it is common to see post-illness diagnoses, such as new diagnosis of delirium; dementia; or renal, respiratory, or cardiac issues that is precipitated by the original illness. This study confirms that this is likely the case with COVID-19 as well.

“Primary care physicians should be vigilant for these complications, including attention to the rehabilitation needs of older patients with longer-term postviral fatigue from COVID-19,” Dr. Shah added.
 

Data predates ‘Omicron wave’

It remains uncertain whether sequelae will differ with the Omicron variant, but the findings remain applicable, Dr. Cohen said.

“We know that illness from the Omicron variant is on average less severe in those that have been vaccinated. However, throughout the Omicron wave, individuals who have not been vaccinated continue to have significant rates of serious illness and hospitalization,” he said.

“Our findings showed that serious illness with hospitalization was associated with a higher rate of sequelae. It can therefore be inferred that the rates of sequelae seen in our study would continue to occur in unvaccinated individuals who contract Omicron, but might occur less frequently in vaccinated individuals who contract Omicron and have less severe illness.”

Dr. Cohen serves as a consultant for Pfizer. Dr. Shah has disclosed no relevant financial relationships.

Nearly one-third of adults over age 65 developed one or more new medical conditions in the weeks following a COVID-19 infection, according to new research.

The findings of the observational study, which were published in the BMJ, show the risk of a new condition being triggered by COVID is more than twice as high in seniors, compared with younger patients. Plus, the researchers observed an even higher risk among those who were hospitalized, with nearly half (46%) of patients having developed new conditions after the acute COVID-19 infection period.

Respiratory failure with shortness of breath was the most common postacute sequela, but a wide range of heart, kidney, lung, liver, cognitive, mental health, and other conditions were diagnosed at least 3 weeks after initial infection and persisted beyond 30 days.

This is one of the first studies to specifically describe the incidence and severity of new conditions triggered by COVID-19 infection in a general sample of older adults, said study author Ken Cohen MD, FACP, executive director of translational research at Optum Labs and national senior medical director at Optum Care.

“Much of what has been published on the postacute sequelae of COVID-19 has been predominantly from a younger population, and many of the patients had been hospitalized,” Dr. Cohen noted. “This was the first study to focus on a large population of seniors, most of whom did not require hospitalization.”

Dr. Cohen and colleagues reviewed the health insurance records of more than 133,000 Medicare beneficiaries aged 65 or older who were diagnosed with COVID-19 before April 2020. They also matched individuals by age, race, sex, hospitalization status, and other factors to comparison groups without COVID-19 (one from 2020 and one from 2019), and to a group diagnosed with other lower respiratory tract viral infections before the pandemic.
 

Risk of developing new conditions was higher in hospitalized

After acute COVID-19 infection, 32% of seniors sought medical care for at least one new medical condition in 2020, compared with 21% of uninfected people in the same year.

The most commonly observed conditions included:

• Respiratory failure (7.55% higher risk).
• Fatigue (5.66% higher risk).
• High blood pressure (4.43% higher risk).
• Memory problems (2.63% higher risk).
• Kidney injury (2.59% higher risk).
• Mental health diagnoses (2.5% higher risk).
• Blood-clotting disorders (1.47 % higher risk).
• Heart rhythm disorders (2.9% higher risk).

The risk of developing new conditions was even higher among those 23,486 who were hospitalized in 2020. Those individuals showed a 23.6% higher risk for developing at least one new condition, compared with uninfected seniors in the same year. Also, patients older than 75 had a higher risk for neurological disorders, including dementia, encephalopathy, and memory problems. The researchers also found that respiratory failure and kidney injury were significantly more likely to affect men and Black patients.

When those who had COVID were compared with the group with other lower respiratory viral infections before the pandemic, only the risks of respiratory failure (2.39% higher), dementia (0.71% higher), and fatigue (0.18% higher) were higher.

Primary care providers can learn from these data to better evaluate and manage their geriatric patients with COVID-19 infection, said Amit Shah, MD, a geriatrician with the Mayo Clinic in Phoenix, in an interview.

“We must assess older patients who have had COVID-19 for more than just improvement from the respiratory symptoms of COVID-19 in post-COVID follow-up visits,” he said. “Older individuals with frailty have vulnerability to subsequent complications from severe illnesses and it is common to see post-illness diagnoses, such as new diagnosis of delirium; dementia; or renal, respiratory, or cardiac issues that is precipitated by the original illness. This study confirms that this is likely the case with COVID-19 as well.

“Primary care physicians should be vigilant for these complications, including attention to the rehabilitation needs of older patients with longer-term postviral fatigue from COVID-19,” Dr. Shah added.
 

Data predates ‘Omicron wave’

It remains uncertain whether sequelae will differ with the Omicron variant, but the findings remain applicable, Dr. Cohen said.

“We know that illness from the Omicron variant is on average less severe in those that have been vaccinated. However, throughout the Omicron wave, individuals who have not been vaccinated continue to have significant rates of serious illness and hospitalization,” he said.

“Our findings showed that serious illness with hospitalization was associated with a higher rate of sequelae. It can therefore be inferred that the rates of sequelae seen in our study would continue to occur in unvaccinated individuals who contract Omicron, but might occur less frequently in vaccinated individuals who contract Omicron and have less severe illness.”

Dr. Cohen serves as a consultant for Pfizer. Dr. Shah has disclosed no relevant financial relationships.

Nearly one-third of adults over age 65 developed one or more new medical conditions in the weeks following a COVID-19 infection, according to new research.

The findings of the observational study, which were published in the BMJ, show the risk of a new condition being triggered by COVID is more than twice as high in seniors, compared with younger patients. Plus, the researchers observed an even higher risk among those who were hospitalized, with nearly half (46%) of patients having developed new conditions after the acute COVID-19 infection period.

Respiratory failure with shortness of breath was the most common postacute sequela, but a wide range of heart, kidney, lung, liver, cognitive, mental health, and other conditions were diagnosed at least 3 weeks after initial infection and persisted beyond 30 days.

This is one of the first studies to specifically describe the incidence and severity of new conditions triggered by COVID-19 infection in a general sample of older adults, said study author Ken Cohen MD, FACP, executive director of translational research at Optum Labs and national senior medical director at Optum Care.

“Much of what has been published on the postacute sequelae of COVID-19 has been predominantly from a younger population, and many of the patients had been hospitalized,” Dr. Cohen noted. “This was the first study to focus on a large population of seniors, most of whom did not require hospitalization.”

Dr. Cohen and colleagues reviewed the health insurance records of more than 133,000 Medicare beneficiaries aged 65 or older who were diagnosed with COVID-19 before April 2020. They also matched individuals by age, race, sex, hospitalization status, and other factors to comparison groups without COVID-19 (one from 2020 and one from 2019), and to a group diagnosed with other lower respiratory tract viral infections before the pandemic.
 

Risk of developing new conditions was higher in hospitalized

After acute COVID-19 infection, 32% of seniors sought medical care for at least one new medical condition in 2020, compared with 21% of uninfected people in the same year.

The most commonly observed conditions included:

• Respiratory failure (7.55% higher risk).
• Fatigue (5.66% higher risk).
• High blood pressure (4.43% higher risk).
• Memory problems (2.63% higher risk).
• Kidney injury (2.59% higher risk).
• Mental health diagnoses (2.5% higher risk).
• Blood-clotting disorders (1.47 % higher risk).
• Heart rhythm disorders (2.9% higher risk).

The risk of developing new conditions was even higher among those 23,486 who were hospitalized in 2020. Those individuals showed a 23.6% higher risk for developing at least one new condition, compared with uninfected seniors in the same year. Also, patients older than 75 had a higher risk for neurological disorders, including dementia, encephalopathy, and memory problems. The researchers also found that respiratory failure and kidney injury were significantly more likely to affect men and Black patients.

When those who had COVID were compared with the group with other lower respiratory viral infections before the pandemic, only the risks of respiratory failure (2.39% higher), dementia (0.71% higher), and fatigue (0.18% higher) were higher.

Primary care providers can learn from these data to better evaluate and manage their geriatric patients with COVID-19 infection, said Amit Shah, MD, a geriatrician with the Mayo Clinic in Phoenix, in an interview.

“We must assess older patients who have had COVID-19 for more than just improvement from the respiratory symptoms of COVID-19 in post-COVID follow-up visits,” he said. “Older individuals with frailty have vulnerability to subsequent complications from severe illnesses and it is common to see post-illness diagnoses, such as new diagnosis of delirium; dementia; or renal, respiratory, or cardiac issues that is precipitated by the original illness. This study confirms that this is likely the case with COVID-19 as well.

“Primary care physicians should be vigilant for these complications, including attention to the rehabilitation needs of older patients with longer-term postviral fatigue from COVID-19,” Dr. Shah added.
 

Data predates ‘Omicron wave’

It remains uncertain whether sequelae will differ with the Omicron variant, but the findings remain applicable, Dr. Cohen said.

“We know that illness from the Omicron variant is on average less severe in those that have been vaccinated. However, throughout the Omicron wave, individuals who have not been vaccinated continue to have significant rates of serious illness and hospitalization,” he said.

“Our findings showed that serious illness with hospitalization was associated with a higher rate of sequelae. It can therefore be inferred that the rates of sequelae seen in our study would continue to occur in unvaccinated individuals who contract Omicron, but might occur less frequently in vaccinated individuals who contract Omicron and have less severe illness.”

Dr. Cohen serves as a consultant for Pfizer. Dr. Shah has disclosed no relevant financial relationships.

Long COVID can affect adults, young people, and children, and now for the first time, in a landmark study accepted for publication in the Archives of Disease in Childhood, formal agreement has been made on a research definition for post–acute COVID-19, or “long COVID” as it is commonly known, in children and young people.

The researchers charged themselves with a single objective – to derive a research definition for long COVID (post–acute COVID-19) in children and young people to allow comparisons between research studies. Specifically, so studies on prevalence, course, and outcome of long COVID in this age group can be reliably compared, because to date there has been no consensus. In fact, the authors pointed out how the “slew of definitions” currently used all differ in number, type, and duration of symptoms, which hampers research efforts. In addition, the lack of definition consensus has contributed to very wide reported variations in the estimated prevalence of long COVID in children of 1%-51%, with the authors saying that a “consistently applied definition of long COVID will help reduce the variability of prevalence estimates.”
 

Statements sequentially whittled down

“Using robust consensus methodology,” the authors said, “we derived a research definition for long COVID in children and young people.”

To achieve the definition consensus, a three-phase online Delphi process was used, followed by a virtual consensus meeting. The 123 participants registered to take part in the study included 23 people (19%) in a lived experience panel, 50 (42%) in the researcher or researcher/service delivery combined panel and 47 (39%) in the service delivery panel. Of 120 registered participants, 105 (88%) completed phase 1, 86 eligible participants (82% of those completing phase 1) completed phase 2 and 77 eligible participants (90% of those completing phase 2) completed phase 3. Seventeen participants attended and voted at the consensus meeting – 4 (23%) from the service delivery panel, 11 (65%) from the researcher panel, and 2 (12%) from the lived experience panel.

Presented with 49 statements in each phase, participants scored these from 1-9 based on how important they were perceived to be with regards inclusion in the research definition of long COVID in children and young people. Having been sequentially whittled down in three phases, 10 statements were discussed at the consensus meeting, and a panel of eight 11- to 17-year-olds affected by long COVID also reviewed the statements to reach a final agreement.

Five of the statements were agreed to be included in the definition, which stated that long COVID in children and young people is a condition in which a child or young person has symptoms (at least one of which is a physical symptom) that have continued or developed after a diagnosis of COVID-19 (confirmed with one or more positive COVID tests); impact their physical, mental, or social well-being; are interfering with some aspect of daily living (for example, school, work, home, or relationships); and persist for a minimum duration of 12 weeks after initial testing for COVID-19 (even if symptoms have waxed and waned over that period).

David Strain, MBChB, MD, chair of the BMA board of science and clinical senior lecturer and honorary consultant, University of Exeter (England), told the Science Media Centre: “A Delphi study builds a consensus from the world’s experts by presenting a series of statements and continuing to refine them until there is agreement as to what the definition of pediatric long COVID should be.” He added: “This is vitally important in order to align the global research effort into long COVID.”
 

Reassuringly similar

From the agreed five statements, a further research definition was proposed to align with the World Health Organization definition for adults: “Post–COVID-19 condition occurs in young people with a history of confirmed SARS CoV-2 infection, with at least one persisting physical symptom for a minimum duration of 12 weeks after initial testing that cannot be explained by an alternative diagnosis. The symptoms have an impact on everyday functioning, may continue or develop after COVID-19 infection, and may fluctuate or relapse over time.”

The authors concluded: “This is the first research definition of long COVID (post–COVID-19 condition) in children and young people and complements the clinical case definition in adults proposed by WHO,” adding that the two definitions are “reassuringly similar.”

They reiterated how widespread adoption of this definition would allow comparisons between studies such that a core outcome set can be developed and the prevalence, course and outcome of long COVID in children and young people can be reliably evaluated, which “will substantially help strengthen the evidence base on this debilitating condition.”

In addition, the authors said that a consistently applied definition of long COVID will help to provide a “more accurate picture on the true impact of the condition.”

The researchers emphasized the need to differentiate between a clinical case definition and a research definition of long COVID and explained: “It is understandable that the patient groups representing people with long COVID are concerned about a definition that could restrict access to services that are needed.”

They went on to say that in their view the decision whether a child or young person can see a health care professional, access any support needed, or be referred, investigated, or treated for long COVID should be a “shared decision involving the young person, their carers, and clinicians.”

Dr. Strain reinforced that it was important that the definition was a research one and not a clinical one, pointing out that the 12-week period in the research definition “does not necessarily mean that a child or young person should need to wait 3 months before being offered help or assistance from their health care team, indeed a 3-month delay in offering support to a child or young person, at this vitally important period of their educational development, could have lasting long-term impacts.”

A version of this article first appeared on Medscape.co.uk.

Long COVID can affect adults, young people, and children, and now for the first time, in a landmark study accepted for publication in the Archives of Disease in Childhood, formal agreement has been made on a research definition for post–acute COVID-19, or “long COVID” as it is commonly known, in children and young people.

The researchers charged themselves with a single objective – to derive a research definition for long COVID (post–acute COVID-19) in children and young people to allow comparisons between research studies. Specifically, so studies on prevalence, course, and outcome of long COVID in this age group can be reliably compared, because to date there has been no consensus. In fact, the authors pointed out how the “slew of definitions” currently used all differ in number, type, and duration of symptoms, which hampers research efforts. In addition, the lack of definition consensus has contributed to very wide reported variations in the estimated prevalence of long COVID in children of 1%-51%, with the authors saying that a “consistently applied definition of long COVID will help reduce the variability of prevalence estimates.”
 

Statements sequentially whittled down

“Using robust consensus methodology,” the authors said, “we derived a research definition for long COVID in children and young people.”

To achieve the definition consensus, a three-phase online Delphi process was used, followed by a virtual consensus meeting. The 123 participants registered to take part in the study included 23 people (19%) in a lived experience panel, 50 (42%) in the researcher or researcher/service delivery combined panel and 47 (39%) in the service delivery panel. Of 120 registered participants, 105 (88%) completed phase 1, 86 eligible participants (82% of those completing phase 1) completed phase 2 and 77 eligible participants (90% of those completing phase 2) completed phase 3. Seventeen participants attended and voted at the consensus meeting – 4 (23%) from the service delivery panel, 11 (65%) from the researcher panel, and 2 (12%) from the lived experience panel.

Presented with 49 statements in each phase, participants scored these from 1-9 based on how important they were perceived to be with regards inclusion in the research definition of long COVID in children and young people. Having been sequentially whittled down in three phases, 10 statements were discussed at the consensus meeting, and a panel of eight 11- to 17-year-olds affected by long COVID also reviewed the statements to reach a final agreement.

Five of the statements were agreed to be included in the definition, which stated that long COVID in children and young people is a condition in which a child or young person has symptoms (at least one of which is a physical symptom) that have continued or developed after a diagnosis of COVID-19 (confirmed with one or more positive COVID tests); impact their physical, mental, or social well-being; are interfering with some aspect of daily living (for example, school, work, home, or relationships); and persist for a minimum duration of 12 weeks after initial testing for COVID-19 (even if symptoms have waxed and waned over that period).

David Strain, MBChB, MD, chair of the BMA board of science and clinical senior lecturer and honorary consultant, University of Exeter (England), told the Science Media Centre: “A Delphi study builds a consensus from the world’s experts by presenting a series of statements and continuing to refine them until there is agreement as to what the definition of pediatric long COVID should be.” He added: “This is vitally important in order to align the global research effort into long COVID.”
 

Reassuringly similar

From the agreed five statements, a further research definition was proposed to align with the World Health Organization definition for adults: “Post–COVID-19 condition occurs in young people with a history of confirmed SARS CoV-2 infection, with at least one persisting physical symptom for a minimum duration of 12 weeks after initial testing that cannot be explained by an alternative diagnosis. The symptoms have an impact on everyday functioning, may continue or develop after COVID-19 infection, and may fluctuate or relapse over time.”

The authors concluded: “This is the first research definition of long COVID (post–COVID-19 condition) in children and young people and complements the clinical case definition in adults proposed by WHO,” adding that the two definitions are “reassuringly similar.”

They reiterated how widespread adoption of this definition would allow comparisons between studies such that a core outcome set can be developed and the prevalence, course and outcome of long COVID in children and young people can be reliably evaluated, which “will substantially help strengthen the evidence base on this debilitating condition.”

In addition, the authors said that a consistently applied definition of long COVID will help to provide a “more accurate picture on the true impact of the condition.”

The researchers emphasized the need to differentiate between a clinical case definition and a research definition of long COVID and explained: “It is understandable that the patient groups representing people with long COVID are concerned about a definition that could restrict access to services that are needed.”

They went on to say that in their view the decision whether a child or young person can see a health care professional, access any support needed, or be referred, investigated, or treated for long COVID should be a “shared decision involving the young person, their carers, and clinicians.”

Dr. Strain reinforced that it was important that the definition was a research one and not a clinical one, pointing out that the 12-week period in the research definition “does not necessarily mean that a child or young person should need to wait 3 months before being offered help or assistance from their health care team, indeed a 3-month delay in offering support to a child or young person, at this vitally important period of their educational development, could have lasting long-term impacts.”

A version of this article first appeared on Medscape.co.uk.

Long COVID can affect adults, young people, and children, and now for the first time, in a landmark study accepted for publication in the Archives of Disease in Childhood, formal agreement has been made on a research definition for post–acute COVID-19, or “long COVID” as it is commonly known, in children and young people.

The researchers charged themselves with a single objective – to derive a research definition for long COVID (post–acute COVID-19) in children and young people to allow comparisons between research studies. Specifically, so studies on prevalence, course, and outcome of long COVID in this age group can be reliably compared, because to date there has been no consensus. In fact, the authors pointed out how the “slew of definitions” currently used all differ in number, type, and duration of symptoms, which hampers research efforts. In addition, the lack of definition consensus has contributed to very wide reported variations in the estimated prevalence of long COVID in children of 1%-51%, with the authors saying that a “consistently applied definition of long COVID will help reduce the variability of prevalence estimates.”
 

Statements sequentially whittled down

“Using robust consensus methodology,” the authors said, “we derived a research definition for long COVID in children and young people.”

To achieve the definition consensus, a three-phase online Delphi process was used, followed by a virtual consensus meeting. The 123 participants registered to take part in the study included 23 people (19%) in a lived experience panel, 50 (42%) in the researcher or researcher/service delivery combined panel and 47 (39%) in the service delivery panel. Of 120 registered participants, 105 (88%) completed phase 1, 86 eligible participants (82% of those completing phase 1) completed phase 2 and 77 eligible participants (90% of those completing phase 2) completed phase 3. Seventeen participants attended and voted at the consensus meeting – 4 (23%) from the service delivery panel, 11 (65%) from the researcher panel, and 2 (12%) from the lived experience panel.

Presented with 49 statements in each phase, participants scored these from 1-9 based on how important they were perceived to be with regards inclusion in the research definition of long COVID in children and young people. Having been sequentially whittled down in three phases, 10 statements were discussed at the consensus meeting, and a panel of eight 11- to 17-year-olds affected by long COVID also reviewed the statements to reach a final agreement.

Five of the statements were agreed to be included in the definition, which stated that long COVID in children and young people is a condition in which a child or young person has symptoms (at least one of which is a physical symptom) that have continued or developed after a diagnosis of COVID-19 (confirmed with one or more positive COVID tests); impact their physical, mental, or social well-being; are interfering with some aspect of daily living (for example, school, work, home, or relationships); and persist for a minimum duration of 12 weeks after initial testing for COVID-19 (even if symptoms have waxed and waned over that period).

David Strain, MBChB, MD, chair of the BMA board of science and clinical senior lecturer and honorary consultant, University of Exeter (England), told the Science Media Centre: “A Delphi study builds a consensus from the world’s experts by presenting a series of statements and continuing to refine them until there is agreement as to what the definition of pediatric long COVID should be.” He added: “This is vitally important in order to align the global research effort into long COVID.”
 

Reassuringly similar

From the agreed five statements, a further research definition was proposed to align with the World Health Organization definition for adults: “Post–COVID-19 condition occurs in young people with a history of confirmed SARS CoV-2 infection, with at least one persisting physical symptom for a minimum duration of 12 weeks after initial testing that cannot be explained by an alternative diagnosis. The symptoms have an impact on everyday functioning, may continue or develop after COVID-19 infection, and may fluctuate or relapse over time.”

The authors concluded: “This is the first research definition of long COVID (post–COVID-19 condition) in children and young people and complements the clinical case definition in adults proposed by WHO,” adding that the two definitions are “reassuringly similar.”

They reiterated how widespread adoption of this definition would allow comparisons between studies such that a core outcome set can be developed and the prevalence, course and outcome of long COVID in children and young people can be reliably evaluated, which “will substantially help strengthen the evidence base on this debilitating condition.”

In addition, the authors said that a consistently applied definition of long COVID will help to provide a “more accurate picture on the true impact of the condition.”

The researchers emphasized the need to differentiate between a clinical case definition and a research definition of long COVID and explained: “It is understandable that the patient groups representing people with long COVID are concerned about a definition that could restrict access to services that are needed.”

They went on to say that in their view the decision whether a child or young person can see a health care professional, access any support needed, or be referred, investigated, or treated for long COVID should be a “shared decision involving the young person, their carers, and clinicians.”

Dr. Strain reinforced that it was important that the definition was a research one and not a clinical one, pointing out that the 12-week period in the research definition “does not necessarily mean that a child or young person should need to wait 3 months before being offered help or assistance from their health care team, indeed a 3-month delay in offering support to a child or young person, at this vitally important period of their educational development, could have lasting long-term impacts.”

A version of this article first appeared on Medscape.co.uk.

It’s a story of promise at a time of urgent need.

Scientists are optimistic about new evidence into what is causing long COVID, a panel of research experts brought together by the New York State Department of Health said.

They proposed many theories on what might be driving long COVID. A role for a virus “cryptic reservoir” that could reactivate at any time, “viral remnants” that trigger chronic inflammation, and action by “autoimmune antibodies” that cause ongoing symptoms are possibilities.

In fact, it’s likely that research will show long COVID is a condition with more than one cause, the experts said during a recent webinar.

People might experience post-infection problems, including organ damage that takes time to heal after initial COVID-19 illness. Or they may be living with post-immune factors, including ongoing immune system responses triggered by autoantibodies.

Determining the cause or causes of long COVID is essential for treatment. For example, if one person’s symptoms persist because of an overactive immune system, “we need to provide immunosuppressant therapies,” Akiko Iwasaki, PhD, said. “But we don’t want to give that to someone who has a persistent virus reservoir,” meaning remnants of the virus remain in their bodies.

Interestingly, a study preprint, which has not been peer reviewed, found dogs were accurate more than half the time in sniffing out long COVID, said Dr. Iwasaki, professor of immunobiology and developmental biology at Yale University, New Haven, Conn.

The dogs were tasked with identifying 45 people with long COVID versus 188 people without it. The findings suggest the presence of a unique chemical in the sweat of people with long COVID that could someday lead to a diagnostic test.
 

Viral persistence possible

If one of the main theories holds, it could be that the coronavirus somehow remains in the body in some form for some people after COVID-19.

Mady Hornig, MD, agreed this is a possibility that needs to be investigated further.

“A weakened immune response to an infection may mean that you have cryptic reservoirs of virus that are continuing to cause symptoms,” she said during the briefing. Dr. Hornig is a doctor-scientist specializing in epidemiology at Columbia University, New York.

“That may explain why some patients with long COVID feel better after vaccination,” because the vaccine creates a strong antibody response to fight COVID-19, Dr. Iwasaki said.

Researchers are unearthing additional potential factors contributing to long COVID.

Viral persistence could also reactivate other dormant viruses in the body, such as Epstein-Barr virus (EBV), said Lawrence Purpura, MD, MPH, an infectious disease specialist at New York Presbyterian/Columbia University. Reactivation of Epstein-Barr is one of four identifying signs of long COVID revealed in a Jan. 25 study published in the journal Cell.
 

Immune overactivation also possible?

For other people with long COVID, it’s not the virus sticking around but the body’s reaction that’s the issue.

Investigators suggest autoimmunity plays a role, and they point to the presence of autoantibodies, for example.

When these autoantibodies persist, they can cause tissue and organ damage over time.

Other investigators are proposing “immune exhaustion” in long COVID because of similarities to chronic fatigue syndrome, Dr. Hornig said.

“It should be ‘all hands on deck’ for research into long COVID,” she said. “The number of disabled individuals who will likely qualify for a diagnosis of [chronic fatigue syndrome] is growing by the second.”
 

Forging ahead on future research

It’s clear there is more work to do. There are investigators working on banking tissue samples from people with long COVID to learn more, for example.

Also, finding a biomarker unique to long COVID could vastly improve the precision of diagnosing long COVID, especially if the dog sniffing option does not pan out.

Of the thousands of biomarker possibilities, Dr. Hornig said, “maybe that’s one or two that ultimately make a real impact on patient care. So it’s going to be critical to find those quickly, translate them, and make them available.”

In the meantime, some answers might come from a large study sponsored by the National Institutes of Health. The NIH is funding the “Researching COVID to Enhance Recovery” project using $470 million from the American Rescue Plan. Investigators at NYU Langone Health are leading the effort and plan to share the wealth by funding more than 100 researchers at more than 30 institutions to create a “metacohort” to study long COVID. More information is available at recovercovid.org.

“Fortunately, through the global research effort, we are now really starting to expand our understanding of how long COVID manifests, how common it is, and what the underlying mechanisms may be,” Dr. Purpura said.

A version of this article first appeared on WebMD.com.

It’s a story of promise at a time of urgent need.

Scientists are optimistic about new evidence into what is causing long COVID, a panel of research experts brought together by the New York State Department of Health said.

They proposed many theories on what might be driving long COVID. A role for a virus “cryptic reservoir” that could reactivate at any time, “viral remnants” that trigger chronic inflammation, and action by “autoimmune antibodies” that cause ongoing symptoms are possibilities.

In fact, it’s likely that research will show long COVID is a condition with more than one cause, the experts said during a recent webinar.

People might experience post-infection problems, including organ damage that takes time to heal after initial COVID-19 illness. Or they may be living with post-immune factors, including ongoing immune system responses triggered by autoantibodies.

Determining the cause or causes of long COVID is essential for treatment. For example, if one person’s symptoms persist because of an overactive immune system, “we need to provide immunosuppressant therapies,” Akiko Iwasaki, PhD, said. “But we don’t want to give that to someone who has a persistent virus reservoir,” meaning remnants of the virus remain in their bodies.

Interestingly, a study preprint, which has not been peer reviewed, found dogs were accurate more than half the time in sniffing out long COVID, said Dr. Iwasaki, professor of immunobiology and developmental biology at Yale University, New Haven, Conn.

The dogs were tasked with identifying 45 people with long COVID versus 188 people without it. The findings suggest the presence of a unique chemical in the sweat of people with long COVID that could someday lead to a diagnostic test.
 

Viral persistence possible

If one of the main theories holds, it could be that the coronavirus somehow remains in the body in some form for some people after COVID-19.

Mady Hornig, MD, agreed this is a possibility that needs to be investigated further.

“A weakened immune response to an infection may mean that you have cryptic reservoirs of virus that are continuing to cause symptoms,” she said during the briefing. Dr. Hornig is a doctor-scientist specializing in epidemiology at Columbia University, New York.

“That may explain why some patients with long COVID feel better after vaccination,” because the vaccine creates a strong antibody response to fight COVID-19, Dr. Iwasaki said.

Researchers are unearthing additional potential factors contributing to long COVID.

Viral persistence could also reactivate other dormant viruses in the body, such as Epstein-Barr virus (EBV), said Lawrence Purpura, MD, MPH, an infectious disease specialist at New York Presbyterian/Columbia University. Reactivation of Epstein-Barr is one of four identifying signs of long COVID revealed in a Jan. 25 study published in the journal Cell.
 

Immune overactivation also possible?

For other people with long COVID, it’s not the virus sticking around but the body’s reaction that’s the issue.

Investigators suggest autoimmunity plays a role, and they point to the presence of autoantibodies, for example.

When these autoantibodies persist, they can cause tissue and organ damage over time.

Other investigators are proposing “immune exhaustion” in long COVID because of similarities to chronic fatigue syndrome, Dr. Hornig said.

“It should be ‘all hands on deck’ for research into long COVID,” she said. “The number of disabled individuals who will likely qualify for a diagnosis of [chronic fatigue syndrome] is growing by the second.”
 

Forging ahead on future research

It’s clear there is more work to do. There are investigators working on banking tissue samples from people with long COVID to learn more, for example.

Also, finding a biomarker unique to long COVID could vastly improve the precision of diagnosing long COVID, especially if the dog sniffing option does not pan out.

Of the thousands of biomarker possibilities, Dr. Hornig said, “maybe that’s one or two that ultimately make a real impact on patient care. So it’s going to be critical to find those quickly, translate them, and make them available.”

In the meantime, some answers might come from a large study sponsored by the National Institutes of Health. The NIH is funding the “Researching COVID to Enhance Recovery” project using $470 million from the American Rescue Plan. Investigators at NYU Langone Health are leading the effort and plan to share the wealth by funding more than 100 researchers at more than 30 institutions to create a “metacohort” to study long COVID. More information is available at recovercovid.org.

“Fortunately, through the global research effort, we are now really starting to expand our understanding of how long COVID manifests, how common it is, and what the underlying mechanisms may be,” Dr. Purpura said.

A version of this article first appeared on WebMD.com.

It’s a story of promise at a time of urgent need.

Scientists are optimistic about new evidence into what is causing long COVID, a panel of research experts brought together by the New York State Department of Health said.

They proposed many theories on what might be driving long COVID. A role for a virus “cryptic reservoir” that could reactivate at any time, “viral remnants” that trigger chronic inflammation, and action by “autoimmune antibodies” that cause ongoing symptoms are possibilities.

In fact, it’s likely that research will show long COVID is a condition with more than one cause, the experts said during a recent webinar.

People might experience post-infection problems, including organ damage that takes time to heal after initial COVID-19 illness. Or they may be living with post-immune factors, including ongoing immune system responses triggered by autoantibodies.

Determining the cause or causes of long COVID is essential for treatment. For example, if one person’s symptoms persist because of an overactive immune system, “we need to provide immunosuppressant therapies,” Akiko Iwasaki, PhD, said. “But we don’t want to give that to someone who has a persistent virus reservoir,” meaning remnants of the virus remain in their bodies.

Interestingly, a study preprint, which has not been peer reviewed, found dogs were accurate more than half the time in sniffing out long COVID, said Dr. Iwasaki, professor of immunobiology and developmental biology at Yale University, New Haven, Conn.

The dogs were tasked with identifying 45 people with long COVID versus 188 people without it. The findings suggest the presence of a unique chemical in the sweat of people with long COVID that could someday lead to a diagnostic test.
 

Viral persistence possible

If one of the main theories holds, it could be that the coronavirus somehow remains in the body in some form for some people after COVID-19.

Mady Hornig, MD, agreed this is a possibility that needs to be investigated further.

“A weakened immune response to an infection may mean that you have cryptic reservoirs of virus that are continuing to cause symptoms,” she said during the briefing. Dr. Hornig is a doctor-scientist specializing in epidemiology at Columbia University, New York.

“That may explain why some patients with long COVID feel better after vaccination,” because the vaccine creates a strong antibody response to fight COVID-19, Dr. Iwasaki said.

Researchers are unearthing additional potential factors contributing to long COVID.

Viral persistence could also reactivate other dormant viruses in the body, such as Epstein-Barr virus (EBV), said Lawrence Purpura, MD, MPH, an infectious disease specialist at New York Presbyterian/Columbia University. Reactivation of Epstein-Barr is one of four identifying signs of long COVID revealed in a Jan. 25 study published in the journal Cell.
 

Immune overactivation also possible?

For other people with long COVID, it’s not the virus sticking around but the body’s reaction that’s the issue.

Investigators suggest autoimmunity plays a role, and they point to the presence of autoantibodies, for example.

When these autoantibodies persist, they can cause tissue and organ damage over time.

Other investigators are proposing “immune exhaustion” in long COVID because of similarities to chronic fatigue syndrome, Dr. Hornig said.

“It should be ‘all hands on deck’ for research into long COVID,” she said. “The number of disabled individuals who will likely qualify for a diagnosis of [chronic fatigue syndrome] is growing by the second.”
 

Forging ahead on future research

It’s clear there is more work to do. There are investigators working on banking tissue samples from people with long COVID to learn more, for example.

Also, finding a biomarker unique to long COVID could vastly improve the precision of diagnosing long COVID, especially if the dog sniffing option does not pan out.

Of the thousands of biomarker possibilities, Dr. Hornig said, “maybe that’s one or two that ultimately make a real impact on patient care. So it’s going to be critical to find those quickly, translate them, and make them available.”

In the meantime, some answers might come from a large study sponsored by the National Institutes of Health. The NIH is funding the “Researching COVID to Enhance Recovery” project using $470 million from the American Rescue Plan. Investigators at NYU Langone Health are leading the effort and plan to share the wealth by funding more than 100 researchers at more than 30 institutions to create a “metacohort” to study long COVID. More information is available at recovercovid.org.

“Fortunately, through the global research effort, we are now really starting to expand our understanding of how long COVID manifests, how common it is, and what the underlying mechanisms may be,” Dr. Purpura said.

A version of this article first appeared on WebMD.com.

Long COVID continues to be a moving target – continuously evolving and still surprising doctors and patients who have sometimes incapacitating long-term symptoms.

Little about the disorder seems predictable at this point. People can have long COVID after asymptomatic, mild, or severe COVID-19, for example. And when a person gets long COVID – also known as long-haul COVID – symptoms can vary widely.

To address all the uncertainty, the New York State Department of Health gathered experts in primary care, pediatrics, physical medicine, rehabilitation, and pulmonology to answer some pressing questions.

New York in 2020 was the first epicenter of the pandemic in the United States, making it also the center of the long COVID epidemic, says Emily Lutterloh, MD, director of the Division of Epidemiology at the New York State Department of Health.
 

What do you do when you’re seeing a patient with long COVID for the first time?

The first exam varies because there are so many different ways long COVID presents itself, says Benjamin Abramoff, MD, a physical medicine and rehabilitation specialist at Penn Medicine in Philadelphia.

I’ve now been seriously ill with #LongCovid for 11 months. I was never hospitalized. I didn’t even have a “mild” covid case. Instead, I developed Long Covid from an asymptomatic infection.

I’m far from unique. Up to 1/5 of asymptomatic patients go on to have long-term symptoms.

— Ravi Veriah Jacques (@RaviHVJ) February 3, 2022

Assessing their previous and current care also helps to direct their ongoing management, says Zijian Chen, MD, medical director of the Center for Post-COVID Care at Mount Sinai Health System in New York.
 

Can vaccination help people with long COVID?

Anything that we can do to help prevent people from being critically ill or being hospitalized with COVID-19 is helpful to prevent long COVID, says Dr. Abramoff, who is also director of the long COVID clinic at the University of Pennsylvania, Philadelphia.

“So that’s something I always discuss with patients. In some research, sometimes patients do feel better after the vaccine,” he says.
 

What kind of therapies do you find helpful for your patients?

Rehabilitation is a key part of recovery from long COVID, Dr. Abramoff says. “It is very important to make this very patient-specific.”

“We have patients that are working. They’re already going to the gym in some cases but don’t feel like they have the same endurance,” he says. “And then we have patients who are so crippled by their fatigue that they can’t get out of bed.”
 

1/ What is #LongCOVID?!

A disabling malady from ongoing inflammation, autoimmunity, & potential viral reservoirs (GI, brain?)

NEW DATA: The Lungs “light up” on special MRI Scans 3 to 9 months later in patients never hospitalized for COVID.https://t.co/I2kyZ4cK5F pic.twitter.com/dL1P67L2DK

— WesElyMD (@WesElyMD) February 2, 2022

An exercise program can help people who have long COVID.

“There’s a big role for therapy services in the recovery of these patients,” says John Baratta, MD, of the department of physical medicine and rehabilitation at the University of North Carolina at Chapel Hill.

But the limited number of long COVID clinics can mean some people are unable to get to therapists trained on the needs of patients with lingering COVID symptoms. Educating community physical and occupational therapists is one solution.
 

How long does it take for people with long COVID to recover and get back to 100% if they can?

Specific numbers aren’t really available, Dr. Baratta says.

“But I can tell you the general trend that I see is that a lot of patients have a gradual improvement of symptoms. The slow but steady improvement with time may be the body’s natural healing process, a result of medical interventions, or both.”

It can help to reassure people with long COVID that they will not be discharged from care until they feel they’ve maximized their health, says Sharagim Kemp, DO, medical director of the COVID Recovery Program for Nuvance Health, a health system in New York and Connecticut.

It’s essential to set realistic recovery expectations and tell patients that not everyone will return to 100% of their pre-COVID functioning, she says.

“Once we are able to help them reset their expectations, there’s almost an accelerated recovery because they are not putting that pressure on themselves anymore,” Dr. Kemp says.
 

What are the most common symptoms you’re seeing in long COVID?

It’s helpful to think of long COVID as a very broad umbrella term, Dr. Abramoff says.

Echoing what many others have observed, fatigue, cognitive dysfunction or “brain fog,“ and shortness of breath or troubled breathing appear to be the most common symptoms, he says.

Some reported vague symptoms, Dr. Kemp says.

People may go to the doctor “not even realizing that they had COVID. That’s one of the important points here – to have a high index of suspicion for patients who come in with multiple symptoms,” she says.

For this reason, patients can report symptoms that don’t necessarily fit into any specialty, says Sarah J. Ryan, MD, an internal medicine doctor at Columbia University Irving Medical Center in New York. People say they are “just not themselves” or they are tired after their COVID-19 recovery.
 

Is there a connection between severe COVID cases and severe long COVID?

“It’s not like that at all. I would say that more than 80% of the patients that we see had mild to moderate illness and they were not hospitalized,” Dr. Baratta says.

Long COVID is a bit different in children and teenagers, says Ixsy Ramirez, MD, a pediatric pulmonologist at University of Michigan Health, Ann Arbor. Most patients in the long COVID clinic at the University of Michigan were previously healthy, and not children with asthma or other lung conditions as one might expect. In fact, many are student athletes, or were before they had long COVID.

In this population, shortness of breath is most common, followed by chest pain and fatigue. Unfortunately, the symptoms are so serious for many kids that their performance is limited, even if they can return to competitive play.
 

Are there defined criteria you use to diagnose long COVID? How do you give someone a diagnosis?

That’s an ever-evolving question, Dr. Kemp says. The generally accepted definition centers on persistent or new symptoms 4 weeks or more after the original COVID-19 illness, but there are exceptions.

Researchers are working on lab tests to help confirm the diagnosis. But without a definitive blood biomarker, getting to the diagnosis requires “some thorough detective work,” Dr. Ryan says.
 

Do you bring in mental health providers to help with treatment?

“We focus on mental health quite a bit actually,” says, Dr. Chen, cofounder of his institution’s COVID recovery clinic. Mount Sinai offers one-on-one and group mental health services, for example.

“Personally, I’ve seen patients that I did not expect to have such severe mental health changes” with long COVID.
 

One of the most powerful accounts and testimonies I have seen on what most #LongCovid patients experience when interacting with their doctors.

“I did not fit in a box, so they chose not to see me, even worse they made me feel like it was my fault for not fitting in their box” pic.twitter.com/7GQLBucuO5

— charlos (@loscharlos) February 3, 2022

Examples include severe depression, cases of acute psychosis, hallucinations, and other problems “that are really unexpected after a viral illness.”

Stony Brook University Hospital in New York has a long COVID clinic staffed by multiple primary care doctors who do exams and refer patients to services. A bonus of offering psychological services to all post-COVID patients is doctors get a more complete picture of each person and a better understanding of what they are going through, says Abigail Chua, MD, a pulmonologist at Stony Brook.

Some empathy is essential, Dr. Baratta says. “It’s important to recognize that a lot of these patients present with a sense of grief or loss for their prior life.”
 

What does the future hold?

A simple test to diagnose long COVID, combined with an effective treatment that helps people feel better within a week, would be ideal, Dr. Abramoff says.

“That would be lovely. But you know, we’re just not at that point.”

And it would be helpful to start identifying subtypes of long COVID so diagnosis and treatment can be more targeted, Dr. Abramoff says. Otherwise, “It’s going to be a very challenging approach to try to treat all of our patients with long COVID symptoms the same way.”

Good clinical trials likewise are needed to address all the subtleties of long COVID.

A number of long COVID centers are collaborating on research to find out more, Dr. Chen says. Actions include setting up a bank of tissue samples from people with long COVID so researchers can continue to figure out the condition.

One goal, Dr. Chen says, would be the ability to treat long COVID rather than just its symptoms.

Long COVID emphasizes the need to prevent people from getting COVID in the first place, Dr. Ramirez says. This will continue to be important, particularly when some people dismiss the seriousness of COVID, comparing it to a cold if they get it. That attitude discounts the large number of people who unfortunately go on to develop long-term, often debilitating, symptoms.

A version of this article first appeared on WebMD.com.

Long COVID continues to be a moving target – continuously evolving and still surprising doctors and patients who have sometimes incapacitating long-term symptoms.

Little about the disorder seems predictable at this point. People can have long COVID after asymptomatic, mild, or severe COVID-19, for example. And when a person gets long COVID – also known as long-haul COVID – symptoms can vary widely.

To address all the uncertainty, the New York State Department of Health gathered experts in primary care, pediatrics, physical medicine, rehabilitation, and pulmonology to answer some pressing questions.

New York in 2020 was the first epicenter of the pandemic in the United States, making it also the center of the long COVID epidemic, says Emily Lutterloh, MD, director of the Division of Epidemiology at the New York State Department of Health.
 

What do you do when you’re seeing a patient with long COVID for the first time?

The first exam varies because there are so many different ways long COVID presents itself, says Benjamin Abramoff, MD, a physical medicine and rehabilitation specialist at Penn Medicine in Philadelphia.

I’ve now been seriously ill with #LongCovid for 11 months. I was never hospitalized. I didn’t even have a “mild” covid case. Instead, I developed Long Covid from an asymptomatic infection.

I’m far from unique. Up to 1/5 of asymptomatic patients go on to have long-term symptoms.

— Ravi Veriah Jacques (@RaviHVJ) February 3, 2022

Assessing their previous and current care also helps to direct their ongoing management, says Zijian Chen, MD, medical director of the Center for Post-COVID Care at Mount Sinai Health System in New York.
 

Can vaccination help people with long COVID?

Anything that we can do to help prevent people from being critically ill or being hospitalized with COVID-19 is helpful to prevent long COVID, says Dr. Abramoff, who is also director of the long COVID clinic at the University of Pennsylvania, Philadelphia.

“So that’s something I always discuss with patients. In some research, sometimes patients do feel better after the vaccine,” he says.
 

What kind of therapies do you find helpful for your patients?

Rehabilitation is a key part of recovery from long COVID, Dr. Abramoff says. “It is very important to make this very patient-specific.”

“We have patients that are working. They’re already going to the gym in some cases but don’t feel like they have the same endurance,” he says. “And then we have patients who are so crippled by their fatigue that they can’t get out of bed.”
 

1/ What is #LongCOVID?!

A disabling malady from ongoing inflammation, autoimmunity, & potential viral reservoirs (GI, brain?)

NEW DATA: The Lungs “light up” on special MRI Scans 3 to 9 months later in patients never hospitalized for COVID.https://t.co/I2kyZ4cK5F pic.twitter.com/dL1P67L2DK

— WesElyMD (@WesElyMD) February 2, 2022

An exercise program can help people who have long COVID.

“There’s a big role for therapy services in the recovery of these patients,” says John Baratta, MD, of the department of physical medicine and rehabilitation at the University of North Carolina at Chapel Hill.

But the limited number of long COVID clinics can mean some people are unable to get to therapists trained on the needs of patients with lingering COVID symptoms. Educating community physical and occupational therapists is one solution.
 

How long does it take for people with long COVID to recover and get back to 100% if they can?

Specific numbers aren’t really available, Dr. Baratta says.

“But I can tell you the general trend that I see is that a lot of patients have a gradual improvement of symptoms. The slow but steady improvement with time may be the body’s natural healing process, a result of medical interventions, or both.”

It can help to reassure people with long COVID that they will not be discharged from care until they feel they’ve maximized their health, says Sharagim Kemp, DO, medical director of the COVID Recovery Program for Nuvance Health, a health system in New York and Connecticut.

It’s essential to set realistic recovery expectations and tell patients that not everyone will return to 100% of their pre-COVID functioning, she says.

“Once we are able to help them reset their expectations, there’s almost an accelerated recovery because they are not putting that pressure on themselves anymore,” Dr. Kemp says.
 

What are the most common symptoms you’re seeing in long COVID?

It’s helpful to think of long COVID as a very broad umbrella term, Dr. Abramoff says.

Echoing what many others have observed, fatigue, cognitive dysfunction or “brain fog,“ and shortness of breath or troubled breathing appear to be the most common symptoms, he says.

Some reported vague symptoms, Dr. Kemp says.

People may go to the doctor “not even realizing that they had COVID. That’s one of the important points here – to have a high index of suspicion for patients who come in with multiple symptoms,” she says.

For this reason, patients can report symptoms that don’t necessarily fit into any specialty, says Sarah J. Ryan, MD, an internal medicine doctor at Columbia University Irving Medical Center in New York. People say they are “just not themselves” or they are tired after their COVID-19 recovery.
 

Is there a connection between severe COVID cases and severe long COVID?

“It’s not like that at all. I would say that more than 80% of the patients that we see had mild to moderate illness and they were not hospitalized,” Dr. Baratta says.

Long COVID is a bit different in children and teenagers, says Ixsy Ramirez, MD, a pediatric pulmonologist at University of Michigan Health, Ann Arbor. Most patients in the long COVID clinic at the University of Michigan were previously healthy, and not children with asthma or other lung conditions as one might expect. In fact, many are student athletes, or were before they had long COVID.

In this population, shortness of breath is most common, followed by chest pain and fatigue. Unfortunately, the symptoms are so serious for many kids that their performance is limited, even if they can return to competitive play.
 

Are there defined criteria you use to diagnose long COVID? How do you give someone a diagnosis?

That’s an ever-evolving question, Dr. Kemp says. The generally accepted definition centers on persistent or new symptoms 4 weeks or more after the original COVID-19 illness, but there are exceptions.

Researchers are working on lab tests to help confirm the diagnosis. But without a definitive blood biomarker, getting to the diagnosis requires “some thorough detective work,” Dr. Ryan says.
 

Do you bring in mental health providers to help with treatment?

“We focus on mental health quite a bit actually,” says, Dr. Chen, cofounder of his institution’s COVID recovery clinic. Mount Sinai offers one-on-one and group mental health services, for example.

“Personally, I’ve seen patients that I did not expect to have such severe mental health changes” with long COVID.
 

One of the most powerful accounts and testimonies I have seen on what most #LongCovid patients experience when interacting with their doctors.

“I did not fit in a box, so they chose not to see me, even worse they made me feel like it was my fault for not fitting in their box” pic.twitter.com/7GQLBucuO5

— charlos (@loscharlos) February 3, 2022

Examples include severe depression, cases of acute psychosis, hallucinations, and other problems “that are really unexpected after a viral illness.”

Stony Brook University Hospital in New York has a long COVID clinic staffed by multiple primary care doctors who do exams and refer patients to services. A bonus of offering psychological services to all post-COVID patients is doctors get a more complete picture of each person and a better understanding of what they are going through, says Abigail Chua, MD, a pulmonologist at Stony Brook.

Some empathy is essential, Dr. Baratta says. “It’s important to recognize that a lot of these patients present with a sense of grief or loss for their prior life.”
 

What does the future hold?

A simple test to diagnose long COVID, combined with an effective treatment that helps people feel better within a week, would be ideal, Dr. Abramoff says.

“That would be lovely. But you know, we’re just not at that point.”

And it would be helpful to start identifying subtypes of long COVID so diagnosis and treatment can be more targeted, Dr. Abramoff says. Otherwise, “It’s going to be a very challenging approach to try to treat all of our patients with long COVID symptoms the same way.”

Good clinical trials likewise are needed to address all the subtleties of long COVID.

A number of long COVID centers are collaborating on research to find out more, Dr. Chen says. Actions include setting up a bank of tissue samples from people with long COVID so researchers can continue to figure out the condition.

One goal, Dr. Chen says, would be the ability to treat long COVID rather than just its symptoms.

Long COVID emphasizes the need to prevent people from getting COVID in the first place, Dr. Ramirez says. This will continue to be important, particularly when some people dismiss the seriousness of COVID, comparing it to a cold if they get it. That attitude discounts the large number of people who unfortunately go on to develop long-term, often debilitating, symptoms.

A version of this article first appeared on WebMD.com.

Long COVID continues to be a moving target – continuously evolving and still surprising doctors and patients who have sometimes incapacitating long-term symptoms.

Little about the disorder seems predictable at this point. People can have long COVID after asymptomatic, mild, or severe COVID-19, for example. And when a person gets long COVID – also known as long-haul COVID – symptoms can vary widely.

To address all the uncertainty, the New York State Department of Health gathered experts in primary care, pediatrics, physical medicine, rehabilitation, and pulmonology to answer some pressing questions.

New York in 2020 was the first epicenter of the pandemic in the United States, making it also the center of the long COVID epidemic, says Emily Lutterloh, MD, director of the Division of Epidemiology at the New York State Department of Health.
 

What do you do when you’re seeing a patient with long COVID for the first time?

The first exam varies because there are so many different ways long COVID presents itself, says Benjamin Abramoff, MD, a physical medicine and rehabilitation specialist at Penn Medicine in Philadelphia.

I’ve now been seriously ill with #LongCovid for 11 months. I was never hospitalized. I didn’t even have a “mild” covid case. Instead, I developed Long Covid from an asymptomatic infection.

I’m far from unique. Up to 1/5 of asymptomatic patients go on to have long-term symptoms.

— Ravi Veriah Jacques (@RaviHVJ) February 3, 2022

Assessing their previous and current care also helps to direct their ongoing management, says Zijian Chen, MD, medical director of the Center for Post-COVID Care at Mount Sinai Health System in New York.
 

Can vaccination help people with long COVID?

Anything that we can do to help prevent people from being critically ill or being hospitalized with COVID-19 is helpful to prevent long COVID, says Dr. Abramoff, who is also director of the long COVID clinic at the University of Pennsylvania, Philadelphia.

“So that’s something I always discuss with patients. In some research, sometimes patients do feel better after the vaccine,” he says.
 

What kind of therapies do you find helpful for your patients?

Rehabilitation is a key part of recovery from long COVID, Dr. Abramoff says. “It is very important to make this very patient-specific.”

“We have patients that are working. They’re already going to the gym in some cases but don’t feel like they have the same endurance,” he says. “And then we have patients who are so crippled by their fatigue that they can’t get out of bed.”
 

1/ What is #LongCOVID?!

A disabling malady from ongoing inflammation, autoimmunity, & potential viral reservoirs (GI, brain?)

NEW DATA: The Lungs “light up” on special MRI Scans 3 to 9 months later in patients never hospitalized for COVID.https://t.co/I2kyZ4cK5F pic.twitter.com/dL1P67L2DK

— WesElyMD (@WesElyMD) February 2, 2022

An exercise program can help people who have long COVID.

“There’s a big role for therapy services in the recovery of these patients,” says John Baratta, MD, of the department of physical medicine and rehabilitation at the University of North Carolina at Chapel Hill.

But the limited number of long COVID clinics can mean some people are unable to get to therapists trained on the needs of patients with lingering COVID symptoms. Educating community physical and occupational therapists is one solution.
 

How long does it take for people with long COVID to recover and get back to 100% if they can?

Specific numbers aren’t really available, Dr. Baratta says.

“But I can tell you the general trend that I see is that a lot of patients have a gradual improvement of symptoms. The slow but steady improvement with time may be the body’s natural healing process, a result of medical interventions, or both.”

It can help to reassure people with long COVID that they will not be discharged from care until they feel they’ve maximized their health, says Sharagim Kemp, DO, medical director of the COVID Recovery Program for Nuvance Health, a health system in New York and Connecticut.

It’s essential to set realistic recovery expectations and tell patients that not everyone will return to 100% of their pre-COVID functioning, she says.

“Once we are able to help them reset their expectations, there’s almost an accelerated recovery because they are not putting that pressure on themselves anymore,” Dr. Kemp says.
 

What are the most common symptoms you’re seeing in long COVID?

It’s helpful to think of long COVID as a very broad umbrella term, Dr. Abramoff says.

Echoing what many others have observed, fatigue, cognitive dysfunction or “brain fog,“ and shortness of breath or troubled breathing appear to be the most common symptoms, he says.

Some reported vague symptoms, Dr. Kemp says.

People may go to the doctor “not even realizing that they had COVID. That’s one of the important points here – to have a high index of suspicion for patients who come in with multiple symptoms,” she says.

For this reason, patients can report symptoms that don’t necessarily fit into any specialty, says Sarah J. Ryan, MD, an internal medicine doctor at Columbia University Irving Medical Center in New York. People say they are “just not themselves” or they are tired after their COVID-19 recovery.
 

Is there a connection between severe COVID cases and severe long COVID?

“It’s not like that at all. I would say that more than 80% of the patients that we see had mild to moderate illness and they were not hospitalized,” Dr. Baratta says.

Long COVID is a bit different in children and teenagers, says Ixsy Ramirez, MD, a pediatric pulmonologist at University of Michigan Health, Ann Arbor. Most patients in the long COVID clinic at the University of Michigan were previously healthy, and not children with asthma or other lung conditions as one might expect. In fact, many are student athletes, or were before they had long COVID.

In this population, shortness of breath is most common, followed by chest pain and fatigue. Unfortunately, the symptoms are so serious for many kids that their performance is limited, even if they can return to competitive play.
 

Are there defined criteria you use to diagnose long COVID? How do you give someone a diagnosis?

That’s an ever-evolving question, Dr. Kemp says. The generally accepted definition centers on persistent or new symptoms 4 weeks or more after the original COVID-19 illness, but there are exceptions.

Researchers are working on lab tests to help confirm the diagnosis. But without a definitive blood biomarker, getting to the diagnosis requires “some thorough detective work,” Dr. Ryan says.
 

Do you bring in mental health providers to help with treatment?

“We focus on mental health quite a bit actually,” says, Dr. Chen, cofounder of his institution’s COVID recovery clinic. Mount Sinai offers one-on-one and group mental health services, for example.

“Personally, I’ve seen patients that I did not expect to have such severe mental health changes” with long COVID.
 

One of the most powerful accounts and testimonies I have seen on what most #LongCovid patients experience when interacting with their doctors.

“I did not fit in a box, so they chose not to see me, even worse they made me feel like it was my fault for not fitting in their box” pic.twitter.com/7GQLBucuO5

— charlos (@loscharlos) February 3, 2022

Examples include severe depression, cases of acute psychosis, hallucinations, and other problems “that are really unexpected after a viral illness.”

Stony Brook University Hospital in New York has a long COVID clinic staffed by multiple primary care doctors who do exams and refer patients to services. A bonus of offering psychological services to all post-COVID patients is doctors get a more complete picture of each person and a better understanding of what they are going through, says Abigail Chua, MD, a pulmonologist at Stony Brook.

Some empathy is essential, Dr. Baratta says. “It’s important to recognize that a lot of these patients present with a sense of grief or loss for their prior life.”
 

What does the future hold?

A simple test to diagnose long COVID, combined with an effective treatment that helps people feel better within a week, would be ideal, Dr. Abramoff says.

“That would be lovely. But you know, we’re just not at that point.”

And it would be helpful to start identifying subtypes of long COVID so diagnosis and treatment can be more targeted, Dr. Abramoff says. Otherwise, “It’s going to be a very challenging approach to try to treat all of our patients with long COVID symptoms the same way.”

Good clinical trials likewise are needed to address all the subtleties of long COVID.

A number of long COVID centers are collaborating on research to find out more, Dr. Chen says. Actions include setting up a bank of tissue samples from people with long COVID so researchers can continue to figure out the condition.

One goal, Dr. Chen says, would be the ability to treat long COVID rather than just its symptoms.

Long COVID emphasizes the need to prevent people from getting COVID in the first place, Dr. Ramirez says. This will continue to be important, particularly when some people dismiss the seriousness of COVID, comparing it to a cold if they get it. That attitude discounts the large number of people who unfortunately go on to develop long-term, often debilitating, symptoms.

A version of this article first appeared on WebMD.com.

Long story short, we still have a lot to learn about long COVID-19.

But it is a real phenomenon with real long-term health effects for people recovering from coronavirus infections. And diagnosing and managing it can get tricky, as some symptoms of long COVID-19 overlap with those of other conditions – and what many people have as they recover from any challenging stay in the ICU.

Risk factors remain largely unknown as well: What makes one person more likely to have symptoms like fatigue, “brain fog,” or headaches versus someone else? Researchers are just starting to offer some intriguing answers, but the evidence is preliminary at this point, experts said at a media briefing sponsored by the Infectious Diseases Society of America.

Unanswered questions include: Does an autoimmune reaction drive long COVID? Does the coronavirus linger in reservoirs within the body and reactivate later? What protection against long COVID do vaccines and treatments offer, if any?

To get a handle on these and other questions, nailing down a standard definition of long COVID would be a good start.

“Studies so far have used different definitions of long COVID,” Nahid Bhadelia, MD, founding director of the Boston University Center for Emerging Infectious Diseases Policy and Research, said during the briefing.

Fatigue is the most commonly symptom of long COVID in research so far, said Dr. Bhadelia, who is also an associate professor of medicine at Boston University.

“What’s difficult in this situation is it’s been 2 years in a global pandemic. We’re all fatigued. How do you tease this apart?” she asked.

Other common symptoms are a hard time thinking quickly – also known as “brain fog” – and the feeling that, despite normal oxygen levels, breathing is difficult, said Kathleen Bell, MD.

Headache, joint and muscle pain, and persistent loss of smell and taste are also widely reported, said Dr. Bell, a professor and chair of the department of physical medicine and rehabilitation at the University of Texas Southwestern Medical Center in Dallas.

Not all the symptoms are physical either.

“Pretty prominent things that we’re seeing are very high levels of anxiety, depression, and insomnia,” Dr. Bell said. These “actually seem to be associated independently with the virus as opposed to just being a completely reactive component.”

More research will be needed to distinguish the causes of these conditions.
 

A difficult diagnosis

Without a standard definition, the wide range of symptoms, and the lack of specific guidance on how to manage them, contribute to making it more challenging to distinguish long COVID from other conditions, the experts said.

“We are starting to see some interesting features of inaccurate attributions to COVID, both on the part of perhaps the person with long COVID symptoms and health care providers,” Dr. Bell said.“It’s sometimes a little difficult to sort it out.”

Dr. Bell said she was not suggesting misdiagnoses are common, “but it is difficult for physicians that don’t see a lot of people with long COVID.”

The advice is to consider other conditions. “You can have both a long COVID syndrome and other syndromes as well,” she said. “As one of my teachers used to say: ‘You can have both ticks and fleas.’ ”
 

Predicting long COVID

In a study getting attention, researchers identified four early things linked to greater chances that someone with COVID-19 will have long-term effects: type 2 diabetes at the time of diagnosis, the presence of specific autoantibodies, unusual levels of SARS-CoV-2 RNA in the blood, and signs of the Epstein-Barr virus in the blood.

The study, published in Cell, followed 309 people 2-3 months after COVID-19.

“That’s important work, but it’s early work,” Dr. Bhadelia said. “I think we still have a while to go in terms of understanding the mechanism of long COVID.”
 

Unexpected patients getting long COVID care

“We are seeing different populations than we all expected to see when this pandemic first started,” Dr. Bell said.

Instead of seeing primarily patients who had severe COVID-19, “the preponderance of people that we’re seeing in long COVID clinics are people who are enabled, were never hospitalized, and have what people might call mild to moderate cases of coronavirus infection,” she said.

Also, instead of just older patients, people of all ages are seeking long COVID care.

One thing that appears more certain is a lack of diversity in people seeking care at long COVID clinics nationwide.

“Many of us who have long COVID specialty clinics will tell you that we are tending to see fairly educated, socioeconomically stable population in these clinics,” Dr. Bell said. “We know that based on the early statistics of who’s getting COVID and having significant COVID that we may not be seeing those populations for follow-up.”
 

Is an autoinflammatory process to blame?

It remains unclear if a hyperinflammatory response is driving persistent post–COVID-19 symptoms. Children and some adults have developed multisystem inflammatory conditions associated with COVID-19, for example.

There is a signal, and “I think there is enough data now to show something does happen,” Dr. Bhadelia said. “The question is, how often does it happen?”

Spending time in critical care, even without COVID-19, can result in persistent symptoms after a hospital stay, such as acute respiratory distress syndrome. Recovery can take time because being in an ICU is “basically the physiologically equivalent of a car crash,” Dr. Bhadelia said. “So you’re recovering from that, too.”

Dr. Bell agreed. “You’re not only recovering from the virus itself, you’re recovering from intubation, secondary infections, secondary lung conditions, perhaps other organ failure, and prolonged bed rest. There are so many things that go into that, that it’s a little bit hard to sort that out from what long COVID is and what the direct effects of the virus are.”
 

Also a research opportunity

“I hate to call it this, but we’ve never had an opportunity [where] we have so many people in such a short amount of time with the same viral disorder,” Dr. Bell said. “We also have the technology to investigate it. This has never happened.

“SARS-CoV-2 is not the only virus. This is just the only one we’ve gotten whacked with in such a huge quantity at one time,” she said.

What researchers learn now about COVID-19 and long COVID “is a model that’s going to be able to be applied in the future to infectious diseases in general,” Dr. Bell predicted.
 

How long will long COVID last?

The vast majority of people with long COVID will get better over time, given enough support and relief of their symptoms, Dr. Bell said.

Type 2 diabetes, preexisting pulmonary disease, and other things could affect how long it takes to recover from long COVID, she said, although more evidence is needed.

“I don’t think at this point that anyone can say how long this long COVID will last because there are a variety of factors,” Dr. Bell said.

A version of this article first appeared on WebMD.com.

Long story short, we still have a lot to learn about long COVID-19.

But it is a real phenomenon with real long-term health effects for people recovering from coronavirus infections. And diagnosing and managing it can get tricky, as some symptoms of long COVID-19 overlap with those of other conditions – and what many people have as they recover from any challenging stay in the ICU.

Risk factors remain largely unknown as well: What makes one person more likely to have symptoms like fatigue, “brain fog,” or headaches versus someone else? Researchers are just starting to offer some intriguing answers, but the evidence is preliminary at this point, experts said at a media briefing sponsored by the Infectious Diseases Society of America.

Unanswered questions include: Does an autoimmune reaction drive long COVID? Does the coronavirus linger in reservoirs within the body and reactivate later? What protection against long COVID do vaccines and treatments offer, if any?

To get a handle on these and other questions, nailing down a standard definition of long COVID would be a good start.

“Studies so far have used different definitions of long COVID,” Nahid Bhadelia, MD, founding director of the Boston University Center for Emerging Infectious Diseases Policy and Research, said during the briefing.

Fatigue is the most commonly symptom of long COVID in research so far, said Dr. Bhadelia, who is also an associate professor of medicine at Boston University.

“What’s difficult in this situation is it’s been 2 years in a global pandemic. We’re all fatigued. How do you tease this apart?” she asked.

Other common symptoms are a hard time thinking quickly – also known as “brain fog” – and the feeling that, despite normal oxygen levels, breathing is difficult, said Kathleen Bell, MD.

Headache, joint and muscle pain, and persistent loss of smell and taste are also widely reported, said Dr. Bell, a professor and chair of the department of physical medicine and rehabilitation at the University of Texas Southwestern Medical Center in Dallas.

Not all the symptoms are physical either.

“Pretty prominent things that we’re seeing are very high levels of anxiety, depression, and insomnia,” Dr. Bell said. These “actually seem to be associated independently with the virus as opposed to just being a completely reactive component.”

More research will be needed to distinguish the causes of these conditions.
 

A difficult diagnosis

Without a standard definition, the wide range of symptoms, and the lack of specific guidance on how to manage them, contribute to making it more challenging to distinguish long COVID from other conditions, the experts said.

“We are starting to see some interesting features of inaccurate attributions to COVID, both on the part of perhaps the person with long COVID symptoms and health care providers,” Dr. Bell said.“It’s sometimes a little difficult to sort it out.”

Dr. Bell said she was not suggesting misdiagnoses are common, “but it is difficult for physicians that don’t see a lot of people with long COVID.”

The advice is to consider other conditions. “You can have both a long COVID syndrome and other syndromes as well,” she said. “As one of my teachers used to say: ‘You can have both ticks and fleas.’ ”
 

Predicting long COVID

In a study getting attention, researchers identified four early things linked to greater chances that someone with COVID-19 will have long-term effects: type 2 diabetes at the time of diagnosis, the presence of specific autoantibodies, unusual levels of SARS-CoV-2 RNA in the blood, and signs of the Epstein-Barr virus in the blood.

The study, published in Cell, followed 309 people 2-3 months after COVID-19.

“That’s important work, but it’s early work,” Dr. Bhadelia said. “I think we still have a while to go in terms of understanding the mechanism of long COVID.”
 

Unexpected patients getting long COVID care

“We are seeing different populations than we all expected to see when this pandemic first started,” Dr. Bell said.

Instead of seeing primarily patients who had severe COVID-19, “the preponderance of people that we’re seeing in long COVID clinics are people who are enabled, were never hospitalized, and have what people might call mild to moderate cases of coronavirus infection,” she said.

Also, instead of just older patients, people of all ages are seeking long COVID care.

One thing that appears more certain is a lack of diversity in people seeking care at long COVID clinics nationwide.

“Many of us who have long COVID specialty clinics will tell you that we are tending to see fairly educated, socioeconomically stable population in these clinics,” Dr. Bell said. “We know that based on the early statistics of who’s getting COVID and having significant COVID that we may not be seeing those populations for follow-up.”
 

Is an autoinflammatory process to blame?

It remains unclear if a hyperinflammatory response is driving persistent post–COVID-19 symptoms. Children and some adults have developed multisystem inflammatory conditions associated with COVID-19, for example.

There is a signal, and “I think there is enough data now to show something does happen,” Dr. Bhadelia said. “The question is, how often does it happen?”

Spending time in critical care, even without COVID-19, can result in persistent symptoms after a hospital stay, such as acute respiratory distress syndrome. Recovery can take time because being in an ICU is “basically the physiologically equivalent of a car crash,” Dr. Bhadelia said. “So you’re recovering from that, too.”

Dr. Bell agreed. “You’re not only recovering from the virus itself, you’re recovering from intubation, secondary infections, secondary lung conditions, perhaps other organ failure, and prolonged bed rest. There are so many things that go into that, that it’s a little bit hard to sort that out from what long COVID is and what the direct effects of the virus are.”
 

Also a research opportunity

“I hate to call it this, but we’ve never had an opportunity [where] we have so many people in such a short amount of time with the same viral disorder,” Dr. Bell said. “We also have the technology to investigate it. This has never happened.

“SARS-CoV-2 is not the only virus. This is just the only one we’ve gotten whacked with in such a huge quantity at one time,” she said.

What researchers learn now about COVID-19 and long COVID “is a model that’s going to be able to be applied in the future to infectious diseases in general,” Dr. Bell predicted.
 

How long will long COVID last?

The vast majority of people with long COVID will get better over time, given enough support and relief of their symptoms, Dr. Bell said.

Type 2 diabetes, preexisting pulmonary disease, and other things could affect how long it takes to recover from long COVID, she said, although more evidence is needed.

“I don’t think at this point that anyone can say how long this long COVID will last because there are a variety of factors,” Dr. Bell said.

A version of this article first appeared on WebMD.com.

Long story short, we still have a lot to learn about long COVID-19.

But it is a real phenomenon with real long-term health effects for people recovering from coronavirus infections. And diagnosing and managing it can get tricky, as some symptoms of long COVID-19 overlap with those of other conditions – and what many people have as they recover from any challenging stay in the ICU.

Risk factors remain largely unknown as well: What makes one person more likely to have symptoms like fatigue, “brain fog,” or headaches versus someone else? Researchers are just starting to offer some intriguing answers, but the evidence is preliminary at this point, experts said at a media briefing sponsored by the Infectious Diseases Society of America.

Unanswered questions include: Does an autoimmune reaction drive long COVID? Does the coronavirus linger in reservoirs within the body and reactivate later? What protection against long COVID do vaccines and treatments offer, if any?

To get a handle on these and other questions, nailing down a standard definition of long COVID would be a good start.

“Studies so far have used different definitions of long COVID,” Nahid Bhadelia, MD, founding director of the Boston University Center for Emerging Infectious Diseases Policy and Research, said during the briefing.

Fatigue is the most commonly symptom of long COVID in research so far, said Dr. Bhadelia, who is also an associate professor of medicine at Boston University.

“What’s difficult in this situation is it’s been 2 years in a global pandemic. We’re all fatigued. How do you tease this apart?” she asked.

Other common symptoms are a hard time thinking quickly – also known as “brain fog” – and the feeling that, despite normal oxygen levels, breathing is difficult, said Kathleen Bell, MD.

Headache, joint and muscle pain, and persistent loss of smell and taste are also widely reported, said Dr. Bell, a professor and chair of the department of physical medicine and rehabilitation at the University of Texas Southwestern Medical Center in Dallas.

Not all the symptoms are physical either.

“Pretty prominent things that we’re seeing are very high levels of anxiety, depression, and insomnia,” Dr. Bell said. These “actually seem to be associated independently with the virus as opposed to just being a completely reactive component.”

More research will be needed to distinguish the causes of these conditions.
 

A difficult diagnosis

Without a standard definition, the wide range of symptoms, and the lack of specific guidance on how to manage them, contribute to making it more challenging to distinguish long COVID from other conditions, the experts said.

“We are starting to see some interesting features of inaccurate attributions to COVID, both on the part of perhaps the person with long COVID symptoms and health care providers,” Dr. Bell said.“It’s sometimes a little difficult to sort it out.”

Dr. Bell said she was not suggesting misdiagnoses are common, “but it is difficult for physicians that don’t see a lot of people with long COVID.”

The advice is to consider other conditions. “You can have both a long COVID syndrome and other syndromes as well,” she said. “As one of my teachers used to say: ‘You can have both ticks and fleas.’ ”
 

Predicting long COVID

In a study getting attention, researchers identified four early things linked to greater chances that someone with COVID-19 will have long-term effects: type 2 diabetes at the time of diagnosis, the presence of specific autoantibodies, unusual levels of SARS-CoV-2 RNA in the blood, and signs of the Epstein-Barr virus in the blood.

The study, published in Cell, followed 309 people 2-3 months after COVID-19.

“That’s important work, but it’s early work,” Dr. Bhadelia said. “I think we still have a while to go in terms of understanding the mechanism of long COVID.”
 

Unexpected patients getting long COVID care

“We are seeing different populations than we all expected to see when this pandemic first started,” Dr. Bell said.

Instead of seeing primarily patients who had severe COVID-19, “the preponderance of people that we’re seeing in long COVID clinics are people who are enabled, were never hospitalized, and have what people might call mild to moderate cases of coronavirus infection,” she said.

Also, instead of just older patients, people of all ages are seeking long COVID care.

One thing that appears more certain is a lack of diversity in people seeking care at long COVID clinics nationwide.

“Many of us who have long COVID specialty clinics will tell you that we are tending to see fairly educated, socioeconomically stable population in these clinics,” Dr. Bell said. “We know that based on the early statistics of who’s getting COVID and having significant COVID that we may not be seeing those populations for follow-up.”
 

Is an autoinflammatory process to blame?

It remains unclear if a hyperinflammatory response is driving persistent post–COVID-19 symptoms. Children and some adults have developed multisystem inflammatory conditions associated with COVID-19, for example.

There is a signal, and “I think there is enough data now to show something does happen,” Dr. Bhadelia said. “The question is, how often does it happen?”

Spending time in critical care, even without COVID-19, can result in persistent symptoms after a hospital stay, such as acute respiratory distress syndrome. Recovery can take time because being in an ICU is “basically the physiologically equivalent of a car crash,” Dr. Bhadelia said. “So you’re recovering from that, too.”

Dr. Bell agreed. “You’re not only recovering from the virus itself, you’re recovering from intubation, secondary infections, secondary lung conditions, perhaps other organ failure, and prolonged bed rest. There are so many things that go into that, that it’s a little bit hard to sort that out from what long COVID is and what the direct effects of the virus are.”
 

Also a research opportunity

“I hate to call it this, but we’ve never had an opportunity [where] we have so many people in such a short amount of time with the same viral disorder,” Dr. Bell said. “We also have the technology to investigate it. This has never happened.

“SARS-CoV-2 is not the only virus. This is just the only one we’ve gotten whacked with in such a huge quantity at one time,” she said.

What researchers learn now about COVID-19 and long COVID “is a model that’s going to be able to be applied in the future to infectious diseases in general,” Dr. Bell predicted.
 

How long will long COVID last?

The vast majority of people with long COVID will get better over time, given enough support and relief of their symptoms, Dr. Bell said.

Type 2 diabetes, preexisting pulmonary disease, and other things could affect how long it takes to recover from long COVID, she said, although more evidence is needed.

“I don’t think at this point that anyone can say how long this long COVID will last because there are a variety of factors,” Dr. Bell said.

A version of this article first appeared on WebMD.com.

A deep molecular dive into COVID-19 patients found that the presence of autoantibodies in peripheral blood at initial diagnosis was the chief of four risk factors predicting if a patient would experience long COVID.

Other significant early predictors of prolonged COVID symptoms – which the researchers called postacute sequelae – were having type 2 diabetes, SARS-CoV-2 RNAemia, and Epstein-Barr virus (EBV) viremia, Yapeng Su, PhD, of the Institute for Systems Biology (ISB) in Seattle, and colleagues wrote in Cell.

Having EBV viremia suggested that latent EBV has been reactivated, the authors noted.

“The most important postacute sequelae [that is conditions that are consequences of a disease] of COVID is the presence of autoantibodies,” James R. Heath, PhD, president of ISB and a bioengineering professor at the University of Washington, Seattle, said in an interview. “It’s about two times more important than the others.”

Dr. Heath and coauthors said early detection of this and other variables could prompt earlier aggressive treatment in patients susceptible to long COVID and ward off lingering symptoms.

“These predictive measures of long COVID can also help to better inform patients of their possible disease course,” study coauthor Daniel G. Chen, an undergraduate researcher at ISB, said in an interview. “We were also able to partially resolve the immunological underpinnings of some postacute sequelae of COVID in a way that suggested potential therapies, and the timing of those therapies.”

For example, he continued, the use of antivirals very early in the infectious course may mitigate the later development of long COVID. “This will, of course, have to be explored in an appropriately designed clinical trial.

“We also identified biomarkers of certain types of long COVID, such as neurological sequelae. Those biomarkers can help define the condition, which is a first step towards developing treatments.”

Study findings

With COVID patients monitored for 2 or 3 months, the study findings of the international “multiomic profiling” analysis include:

• Subclinical patient autoantibodies that reduce anti–SARS-CoV-2 antibodies suggest there is immune dysregulation during COVID-19 infection.
• Reactivation of latent other viruses during initial infection may be contributing to long COVID.
• Gastrointestinal postacute sequelae of COVID presents with a unique postacute expansion of cytotoxic T cells.
• SARS-CoV-2–specific and cytomegalovirus-specific CD8+ T cells displayed unique dynamics during recovery from infection.

According to the authors, as many as 69% of COVID-19 patients suffer from long COVID – a range of new, recurrent, or ongoing problems 4 or more weeks following initial SARS-CoV-2 infection. These may include memory loss, gastrointestinal distress, fatigue, anosmia, and shortness of breath.

Long COVID has been associated with acute disease severity, and is suspected to be related to autoimmune factors and unresolved viral fragments, according to the paper.
 

Research methods

The international study did a deep and detailed dive into multiple molecular markers of long COVID. It enrolled 209 COVID-19 patients with varying degrees of disease severity and matched them to 457 healthy controls. The researchers’ goal was to identify discrete and quantifiable long COVID factors and guide possible preemptive treatment. 

Patients were assessed at three time points: at initial diagnosis, during the acute disease phase about a week later, and again 2 to 3 months post onset of symptoms after recovery from the acute phase of COVID. At the third assessment, some patients had lingering symptoms such as fatigue (52% ), cough (25%), and loss of taste or sense of smell (18%).

Blood draws were analyzed for autoantibodies and SARS-CoV-2–specific antibodies, global plasma proteomic and metabolomic profiles, and single-cell multiomic characterizations of peripheral blood mononuclear cells.

Each blood draw was paired with nasal-swab and plasma measurements of SARS-CoV-2 viral load and the data sets were integrated with electronic health records and self-reported patient symptoms to guide the interpretation of the molecular signatures of long COVID.
 

Author conclusions

The authors found an association between T2 hyperinflammation and long COVID–anticipating autoantibodies. This association further implies that hyperinflammation-controlling therapies in the acute stage of COVID may influence whether a patient experiences long COVID. “However, the detailed timing and context of these therapies matter, and, thus, future well-controlled studies will be needed to test these and other therapeutic implications,” Dr. Su and colleagues wrote.

Moreover, the negative correlations between anti–SARS-CoV-2 IgG and certain autoantibodies may suggest that patients with elevated autoantibody levels are more susceptible to breakthrough infections, the authors said.

“Many patients with high autoantibodies simultaneously have low protective antibodies that neutralize SARS-CoV-2, and that’s going to make them more susceptible to breakthrough infections,” Mr. Chen explained.*

“Detectability of most [long COVID-19 factors] at COVID diagnosis emphasizes the importance of early disease measurements for understanding emergent chronic conditions and suggests [long COVID] treatment strategies,” they wrote.

According to Mr. Chen, there are clear similarities in underlying immunobiology between patients with COVID autoantibodies and patients with systemic lupus erythematosus.

“These findings are also helping us frame our thinking around other chronic autoimmune conditions, such as postacute Lyme syndrome, for example,” said Dr. Heath.

The bottom line, said Mr. Chen, is that measuring early long COVID indicators may result in preventive treatments. “An example is the cortisol deficiency we see in certain long COVID patients. There are known treatments such as cortisol replacement therapy that should be explored for this group.”

Outside expert’s take on findings

Commenting on the study, Sherry Hsiang-Yi Chou, MD, who was not involved in the research, called the study a very important first step in understanding the path of this complex phenomenon and perhaps other conditions with long-term side effects.

“The researchers have done huge amount of innovative scientific work. They’ve shown the DNA signature of how our bodies respond to this disease,” said Dr. Chou, who is chief of the division of neurocritical care at Northwestern Medicine in Chicago.

“This type of research will help us scientifically understand and differentiate the various syndromes within long COVID. It will help identify who’s at risk for different aspects of this syndrome and lead to following them for longer periods in clinical trials,” she added.

The authors acknowledged that lengthier studies in larger cohorts were needed to see which patients will develop long-term chronic postacute sequelae of COVID.

This research was supported by the Wilke Family Foundation, the Parker Institute for Cancer Immunotherapy, Merck, and the Biomedical Advanced Research and Development Authority. Other support came from the National Institutes of Health, the Bill and Melinda Gates Foundation, Saint John’s Cancer Center, Fred Hutchinson Cancer Research Center, and the European Union’s Horizon 2020 research and innovation program. Dr. Heath is a cofounder of Pact Pharma. He and several coauthors disclosed various ties to multiple private-sector companies. Mr. Chen and Dr. Chou had no competing interests.

*Correction, 1/28: An earlier version of this story misidentified Daniel G. Chen, an undergraduate researcher at ISB.

A deep molecular dive into COVID-19 patients found that the presence of autoantibodies in peripheral blood at initial diagnosis was the chief of four risk factors predicting if a patient would experience long COVID.

Other significant early predictors of prolonged COVID symptoms – which the researchers called postacute sequelae – were having type 2 diabetes, SARS-CoV-2 RNAemia, and Epstein-Barr virus (EBV) viremia, Yapeng Su, PhD, of the Institute for Systems Biology (ISB) in Seattle, and colleagues wrote in Cell.

Having EBV viremia suggested that latent EBV has been reactivated, the authors noted.

“The most important postacute sequelae [that is conditions that are consequences of a disease] of COVID is the presence of autoantibodies,” James R. Heath, PhD, president of ISB and a bioengineering professor at the University of Washington, Seattle, said in an interview. “It’s about two times more important than the others.”

Dr. Heath and coauthors said early detection of this and other variables could prompt earlier aggressive treatment in patients susceptible to long COVID and ward off lingering symptoms.

“These predictive measures of long COVID can also help to better inform patients of their possible disease course,” study coauthor Daniel G. Chen, an undergraduate researcher at ISB, said in an interview. “We were also able to partially resolve the immunological underpinnings of some postacute sequelae of COVID in a way that suggested potential therapies, and the timing of those therapies.”

For example, he continued, the use of antivirals very early in the infectious course may mitigate the later development of long COVID. “This will, of course, have to be explored in an appropriately designed clinical trial.

“We also identified biomarkers of certain types of long COVID, such as neurological sequelae. Those biomarkers can help define the condition, which is a first step towards developing treatments.”

Study findings

With COVID patients monitored for 2 or 3 months, the study findings of the international “multiomic profiling” analysis include:

• Subclinical patient autoantibodies that reduce anti–SARS-CoV-2 antibodies suggest there is immune dysregulation during COVID-19 infection.
• Reactivation of latent other viruses during initial infection may be contributing to long COVID.
• Gastrointestinal postacute sequelae of COVID presents with a unique postacute expansion of cytotoxic T cells.
• SARS-CoV-2–specific and cytomegalovirus-specific CD8+ T cells displayed unique dynamics during recovery from infection.

According to the authors, as many as 69% of COVID-19 patients suffer from long COVID – a range of new, recurrent, or ongoing problems 4 or more weeks following initial SARS-CoV-2 infection. These may include memory loss, gastrointestinal distress, fatigue, anosmia, and shortness of breath.

Long COVID has been associated with acute disease severity, and is suspected to be related to autoimmune factors and unresolved viral fragments, according to the paper.
 

Research methods

The international study did a deep and detailed dive into multiple molecular markers of long COVID. It enrolled 209 COVID-19 patients with varying degrees of disease severity and matched them to 457 healthy controls. The researchers’ goal was to identify discrete and quantifiable long COVID factors and guide possible preemptive treatment. 

Patients were assessed at three time points: at initial diagnosis, during the acute disease phase about a week later, and again 2 to 3 months post onset of symptoms after recovery from the acute phase of COVID. At the third assessment, some patients had lingering symptoms such as fatigue (52% ), cough (25%), and loss of taste or sense of smell (18%).

Blood draws were analyzed for autoantibodies and SARS-CoV-2–specific antibodies, global plasma proteomic and metabolomic profiles, and single-cell multiomic characterizations of peripheral blood mononuclear cells.

Each blood draw was paired with nasal-swab and plasma measurements of SARS-CoV-2 viral load and the data sets were integrated with electronic health records and self-reported patient symptoms to guide the interpretation of the molecular signatures of long COVID.
 

Author conclusions

The authors found an association between T2 hyperinflammation and long COVID–anticipating autoantibodies. This association further implies that hyperinflammation-controlling therapies in the acute stage of COVID may influence whether a patient experiences long COVID. “However, the detailed timing and context of these therapies matter, and, thus, future well-controlled studies will be needed to test these and other therapeutic implications,” Dr. Su and colleagues wrote.

Moreover, the negative correlations between anti–SARS-CoV-2 IgG and certain autoantibodies may suggest that patients with elevated autoantibody levels are more susceptible to breakthrough infections, the authors said.

“Many patients with high autoantibodies simultaneously have low protective antibodies that neutralize SARS-CoV-2, and that’s going to make them more susceptible to breakthrough infections,” Mr. Chen explained.*

“Detectability of most [long COVID-19 factors] at COVID diagnosis emphasizes the importance of early disease measurements for understanding emergent chronic conditions and suggests [long COVID] treatment strategies,” they wrote.

According to Mr. Chen, there are clear similarities in underlying immunobiology between patients with COVID autoantibodies and patients with systemic lupus erythematosus.

“These findings are also helping us frame our thinking around other chronic autoimmune conditions, such as postacute Lyme syndrome, for example,” said Dr. Heath.

The bottom line, said Mr. Chen, is that measuring early long COVID indicators may result in preventive treatments. “An example is the cortisol deficiency we see in certain long COVID patients. There are known treatments such as cortisol replacement therapy that should be explored for this group.”

Outside expert’s take on findings

Commenting on the study, Sherry Hsiang-Yi Chou, MD, who was not involved in the research, called the study a very important first step in understanding the path of this complex phenomenon and perhaps other conditions with long-term side effects.

“The researchers have done huge amount of innovative scientific work. They’ve shown the DNA signature of how our bodies respond to this disease,” said Dr. Chou, who is chief of the division of neurocritical care at Northwestern Medicine in Chicago.

“This type of research will help us scientifically understand and differentiate the various syndromes within long COVID. It will help identify who’s at risk for different aspects of this syndrome and lead to following them for longer periods in clinical trials,” she added.

The authors acknowledged that lengthier studies in larger cohorts were needed to see which patients will develop long-term chronic postacute sequelae of COVID.

This research was supported by the Wilke Family Foundation, the Parker Institute for Cancer Immunotherapy, Merck, and the Biomedical Advanced Research and Development Authority. Other support came from the National Institutes of Health, the Bill and Melinda Gates Foundation, Saint John’s Cancer Center, Fred Hutchinson Cancer Research Center, and the European Union’s Horizon 2020 research and innovation program. Dr. Heath is a cofounder of Pact Pharma. He and several coauthors disclosed various ties to multiple private-sector companies. Mr. Chen and Dr. Chou had no competing interests.

*Correction, 1/28: An earlier version of this story misidentified Daniel G. Chen, an undergraduate researcher at ISB.

A deep molecular dive into COVID-19 patients found that the presence of autoantibodies in peripheral blood at initial diagnosis was the chief of four risk factors predicting if a patient would experience long COVID.

Other significant early predictors of prolonged COVID symptoms – which the researchers called postacute sequelae – were having type 2 diabetes, SARS-CoV-2 RNAemia, and Epstein-Barr virus (EBV) viremia, Yapeng Su, PhD, of the Institute for Systems Biology (ISB) in Seattle, and colleagues wrote in Cell.

Having EBV viremia suggested that latent EBV has been reactivated, the authors noted.

“The most important postacute sequelae [that is conditions that are consequences of a disease] of COVID is the presence of autoantibodies,” James R. Heath, PhD, president of ISB and a bioengineering professor at the University of Washington, Seattle, said in an interview. “It’s about two times more important than the others.”

Dr. Heath and coauthors said early detection of this and other variables could prompt earlier aggressive treatment in patients susceptible to long COVID and ward off lingering symptoms.

“These predictive measures of long COVID can also help to better inform patients of their possible disease course,” study coauthor Daniel G. Chen, an undergraduate researcher at ISB, said in an interview. “We were also able to partially resolve the immunological underpinnings of some postacute sequelae of COVID in a way that suggested potential therapies, and the timing of those therapies.”

For example, he continued, the use of antivirals very early in the infectious course may mitigate the later development of long COVID. “This will, of course, have to be explored in an appropriately designed clinical trial.

“We also identified biomarkers of certain types of long COVID, such as neurological sequelae. Those biomarkers can help define the condition, which is a first step towards developing treatments.”

Study findings

With COVID patients monitored for 2 or 3 months, the study findings of the international “multiomic profiling” analysis include:

• Subclinical patient autoantibodies that reduce anti–SARS-CoV-2 antibodies suggest there is immune dysregulation during COVID-19 infection.
• Reactivation of latent other viruses during initial infection may be contributing to long COVID.
• Gastrointestinal postacute sequelae of COVID presents with a unique postacute expansion of cytotoxic T cells.
• SARS-CoV-2–specific and cytomegalovirus-specific CD8+ T cells displayed unique dynamics during recovery from infection.

According to the authors, as many as 69% of COVID-19 patients suffer from long COVID – a range of new, recurrent, or ongoing problems 4 or more weeks following initial SARS-CoV-2 infection. These may include memory loss, gastrointestinal distress, fatigue, anosmia, and shortness of breath.

Long COVID has been associated with acute disease severity, and is suspected to be related to autoimmune factors and unresolved viral fragments, according to the paper.
 

Research methods

The international study did a deep and detailed dive into multiple molecular markers of long COVID. It enrolled 209 COVID-19 patients with varying degrees of disease severity and matched them to 457 healthy controls. The researchers’ goal was to identify discrete and quantifiable long COVID factors and guide possible preemptive treatment. 

Patients were assessed at three time points: at initial diagnosis, during the acute disease phase about a week later, and again 2 to 3 months post onset of symptoms after recovery from the acute phase of COVID. At the third assessment, some patients had lingering symptoms such as fatigue (52% ), cough (25%), and loss of taste or sense of smell (18%).

Blood draws were analyzed for autoantibodies and SARS-CoV-2–specific antibodies, global plasma proteomic and metabolomic profiles, and single-cell multiomic characterizations of peripheral blood mononuclear cells.

Each blood draw was paired with nasal-swab and plasma measurements of SARS-CoV-2 viral load and the data sets were integrated with electronic health records and self-reported patient symptoms to guide the interpretation of the molecular signatures of long COVID.
 

Author conclusions

The authors found an association between T2 hyperinflammation and long COVID–anticipating autoantibodies. This association further implies that hyperinflammation-controlling therapies in the acute stage of COVID may influence whether a patient experiences long COVID. “However, the detailed timing and context of these therapies matter, and, thus, future well-controlled studies will be needed to test these and other therapeutic implications,” Dr. Su and colleagues wrote.

Moreover, the negative correlations between anti–SARS-CoV-2 IgG and certain autoantibodies may suggest that patients with elevated autoantibody levels are more susceptible to breakthrough infections, the authors said.

“Many patients with high autoantibodies simultaneously have low protective antibodies that neutralize SARS-CoV-2, and that’s going to make them more susceptible to breakthrough infections,” Mr. Chen explained.*

“Detectability of most [long COVID-19 factors] at COVID diagnosis emphasizes the importance of early disease measurements for understanding emergent chronic conditions and suggests [long COVID] treatment strategies,” they wrote.

According to Mr. Chen, there are clear similarities in underlying immunobiology between patients with COVID autoantibodies and patients with systemic lupus erythematosus.

“These findings are also helping us frame our thinking around other chronic autoimmune conditions, such as postacute Lyme syndrome, for example,” said Dr. Heath.

The bottom line, said Mr. Chen, is that measuring early long COVID indicators may result in preventive treatments. “An example is the cortisol deficiency we see in certain long COVID patients. There are known treatments such as cortisol replacement therapy that should be explored for this group.”

Outside expert’s take on findings

Commenting on the study, Sherry Hsiang-Yi Chou, MD, who was not involved in the research, called the study a very important first step in understanding the path of this complex phenomenon and perhaps other conditions with long-term side effects.

“The researchers have done huge amount of innovative scientific work. They’ve shown the DNA signature of how our bodies respond to this disease,” said Dr. Chou, who is chief of the division of neurocritical care at Northwestern Medicine in Chicago.

“This type of research will help us scientifically understand and differentiate the various syndromes within long COVID. It will help identify who’s at risk for different aspects of this syndrome and lead to following them for longer periods in clinical trials,” she added.

The authors acknowledged that lengthier studies in larger cohorts were needed to see which patients will develop long-term chronic postacute sequelae of COVID.

This research was supported by the Wilke Family Foundation, the Parker Institute for Cancer Immunotherapy, Merck, and the Biomedical Advanced Research and Development Authority. Other support came from the National Institutes of Health, the Bill and Melinda Gates Foundation, Saint John’s Cancer Center, Fred Hutchinson Cancer Research Center, and the European Union’s Horizon 2020 research and innovation program. Dr. Heath is a cofounder of Pact Pharma. He and several coauthors disclosed various ties to multiple private-sector companies. Mr. Chen and Dr. Chou had no competing interests.

*Correction, 1/28: An earlier version of this story misidentified Daniel G. Chen, an undergraduate researcher at ISB.

Impaired cognition associated with COVID-19 appears to have a biological versus psychological basis, early research suggests. Investigators found abnormalities in cerebrospinal fluid (CSF) and other risk factors, including diabetes and hypertension, present in individuals with mild COVID-19 experiencing persistent cognitive problems, often referred to as “brain fog.”

“We’re seeing changes to the [CSF] in the brain of most people who report cognitive changes,” said Joanna Hellmuth, MD, assistant professor of neurology, Memory and Aging Center, University of California, San Francisco. “We’re just in the beginning stages, but I hope this study will provide some legitimacy to this being a true neurologic condition.”

The study was published online Jan. 18, 2022, in Annals of Clinical and Translational Neurology.
 

No guidance

There is currently no guidance on how to identify patients with COVID-related cognitive changes, said Dr. Hellmuth. “The term ‘brain fog’ is not based in science or medicine, but that’s the most common term we use to describe this.”

The analysis included adults with confirmed SARS-CoV-2 infection not requiring hospitalization who were enrolled in the Long-term Impact of Infection with Novel Coronavirus study.

Participants underwent a structured interview that covered COVID-19 illness, past medical history, preexisting cognitive risk factors, medications, and cognitive symptoms following onset of COVID-19. They also completed an in-person battery of cognitive tests.

The analysis included 22 participants with at least one new cognitive symptom who had cognitive post-acute sequelae of SARS-CoV-2 infection (PASC). Ten cognitive controls reported no new cognitive symptoms after acute infection.

Participants were a median age of 41 years, had a median of 16 years of education, and were assessed a median of 10.1 months from their first COVID-19 symptom. There were no group differences in terms of age, gender, years of education, or distribution of race/ethnicity (all P > .05).

Among those with cognitive PASC, 43% reported cognitive symptoms starting 1 or more months after the first COVID symptom. About 29% reported cognitive changes started 2 or more months after their first COVID symptom.

“The immune system could be altered in some way after the infection, and perhaps that’s what’s contributing to these delayed onset cognitive changes,” said Dr. Hellmuth.

Compared with controls, participants with cognitive PASC had more preexisting cognitive risk factors (a median of 2.5 vs. 0; P = .03). These included hypertension and diabetes, which increase the risk of stroke, mild cognitive impairment, vascular dementia, traumatic brain injury, (TBI), learning disabilities, anxiety, depression, stimulant use, and ADHD, which may make the brain more vulnerable to executive functioning problems.

Dr. Hellmuth noted that the study wasn’t powered to determine whether any individual risk factor was associated with risk of cognitive changes.

As there are no published neuropsychological testing criteria for cognitive PASC, the researchers applied the equivalent criteria for HIV-associated neurocognitive disorder (HAND), a similar, virally associated cognitive disorder. Only 59% of those with cognitive PASC met equivalent HAND criteria for objective cognitive impairment versus 70% of cognitive controls. This, the investigators noted, highlights “the challenges and incongruities of using subjective, versus objective cognitive assessments for diagnosis.”
 

Is self-report enough?

While there is currently “nothing objective doctors can hang their hats on to say ‘you do’ or ‘you don’t’ have cognitive changes related to COVID,” using the HAND criteria is “not particularly helpful,” said Dr. Hellmuth. “Comparing an individual to a population-based norm in this case is really nuanced, and we shouldn’t rely on this solely to determine whether they do, or don’t, have cognitive changes.”

Perhaps self-reports in this case are “enough” said Dr. Hellmuth. “People know their brains better than anyone else, better than any doctor will.”

A total of 13 in the cognitive PASC group and 4 in the control group consented to a lumbar puncture. Cognitive PASC participants were older than controls (median of 47 vs. 28 years; P = .03) with no other between-group differences.

Overall, 77% of participants with cognitive PASC had a CSF abnormality, compared with 0% of cognitive controls (P = .01). CSF abnormalities included elevated protein levels with no other explainable cause in 2 of the 13 subjects with PASC, which Dr. Hellmuth said is typically a marker of inflammation.

Researchers also noted abnormal oligoclonal banding, a collection of antibodies, in the blood or brain fluid. These were identified in 69% of participants with cognitive PASC, compared with 0% of cognitive controls (P = .03).

“When we find this pattern in both blood and brain, it suggests a systemic inflammatory disorder,” although “we have no idea what these antibodies are targeting,” said Dr. Hellmuth.

The study represents “the very beginning stages” of PASC becoming a medical diagnosis “where doctors know what to call it, how to treat it, and how to do blood and cerebrospinal fluid tests to diagnose it,” said Dr. Hellmuth.

She hopes PASC will receive medical legitimacy just as TBI has. In years past, a player was hit on the head or had their “bell rung,” simply returned to the field. “Now that we understand the science, we call it a mild TBI or concussion, and we have a very different medical approach to it.”

A limitation of the study was the small sample size, which may hinder the results’ validity. In addition, the study demographics may not reflect the broader population of those impacted by PASC.
 

‘A first substantial step’

Commenting on the research, William Schaffner, MD, professor, division of infectious diseases, Vanderbilt University Medical Center, Nashville, Tenn., said the new results represent “a first substantial step on the road to trying to find out what’s going on” with COVID patients dealing with cognitive issues.

Dr. Schaffner noted that elevated protein levels, identified in some study subjects, “is usually a consequence of previous inflammation” and is “a very interesting” finding. “In people who are otherwise normal, if you do a lumbar puncture, you don’t find elevated proteins.”

However, he noted the “diversity of results” from CSF examinations. “A single pattern does not leap out.”

What the researchers are observing “is not just a phenomenon of the mind or just something psychological,” said Dr. Schaffner. “Something physical is going on here.”

The study was funded by grants from the National Institute of Mental Health and the National Institute of Neurological Disorders and Stroke. Dr. Hellmuth received grant support from the National Institutes of Health/NIMH supporting this work and personal fees for medical-legal consultation outside of the submitted work. Dr. Schaffner has disclosed not relevant financial relationships.

A version of this article first appeared on Medscape.com.

Impaired cognition associated with COVID-19 appears to have a biological versus psychological basis, early research suggests. Investigators found abnormalities in cerebrospinal fluid (CSF) and other risk factors, including diabetes and hypertension, present in individuals with mild COVID-19 experiencing persistent cognitive problems, often referred to as “brain fog.”

“We’re seeing changes to the [CSF] in the brain of most people who report cognitive changes,” said Joanna Hellmuth, MD, assistant professor of neurology, Memory and Aging Center, University of California, San Francisco. “We’re just in the beginning stages, but I hope this study will provide some legitimacy to this being a true neurologic condition.”

The study was published online Jan. 18, 2022, in Annals of Clinical and Translational Neurology.
 

No guidance

There is currently no guidance on how to identify patients with COVID-related cognitive changes, said Dr. Hellmuth. “The term ‘brain fog’ is not based in science or medicine, but that’s the most common term we use to describe this.”

The analysis included adults with confirmed SARS-CoV-2 infection not requiring hospitalization who were enrolled in the Long-term Impact of Infection with Novel Coronavirus study.

Participants underwent a structured interview that covered COVID-19 illness, past medical history, preexisting cognitive risk factors, medications, and cognitive symptoms following onset of COVID-19. They also completed an in-person battery of cognitive tests.

The analysis included 22 participants with at least one new cognitive symptom who had cognitive post-acute sequelae of SARS-CoV-2 infection (PASC). Ten cognitive controls reported no new cognitive symptoms after acute infection.

Participants were a median age of 41 years, had a median of 16 years of education, and were assessed a median of 10.1 months from their first COVID-19 symptom. There were no group differences in terms of age, gender, years of education, or distribution of race/ethnicity (all P > .05).

Among those with cognitive PASC, 43% reported cognitive symptoms starting 1 or more months after the first COVID symptom. About 29% reported cognitive changes started 2 or more months after their first COVID symptom.

“The immune system could be altered in some way after the infection, and perhaps that’s what’s contributing to these delayed onset cognitive changes,” said Dr. Hellmuth.

Compared with controls, participants with cognitive PASC had more preexisting cognitive risk factors (a median of 2.5 vs. 0; P = .03). These included hypertension and diabetes, which increase the risk of stroke, mild cognitive impairment, vascular dementia, traumatic brain injury, (TBI), learning disabilities, anxiety, depression, stimulant use, and ADHD, which may make the brain more vulnerable to executive functioning problems.

Dr. Hellmuth noted that the study wasn’t powered to determine whether any individual risk factor was associated with risk of cognitive changes.

As there are no published neuropsychological testing criteria for cognitive PASC, the researchers applied the equivalent criteria for HIV-associated neurocognitive disorder (HAND), a similar, virally associated cognitive disorder. Only 59% of those with cognitive PASC met equivalent HAND criteria for objective cognitive impairment versus 70% of cognitive controls. This, the investigators noted, highlights “the challenges and incongruities of using subjective, versus objective cognitive assessments for diagnosis.”
 

Is self-report enough?

While there is currently “nothing objective doctors can hang their hats on to say ‘you do’ or ‘you don’t’ have cognitive changes related to COVID,” using the HAND criteria is “not particularly helpful,” said Dr. Hellmuth. “Comparing an individual to a population-based norm in this case is really nuanced, and we shouldn’t rely on this solely to determine whether they do, or don’t, have cognitive changes.”

Perhaps self-reports in this case are “enough” said Dr. Hellmuth. “People know their brains better than anyone else, better than any doctor will.”

A total of 13 in the cognitive PASC group and 4 in the control group consented to a lumbar puncture. Cognitive PASC participants were older than controls (median of 47 vs. 28 years; P = .03) with no other between-group differences.

Overall, 77% of participants with cognitive PASC had a CSF abnormality, compared with 0% of cognitive controls (P = .01). CSF abnormalities included elevated protein levels with no other explainable cause in 2 of the 13 subjects with PASC, which Dr. Hellmuth said is typically a marker of inflammation.

Researchers also noted abnormal oligoclonal banding, a collection of antibodies, in the blood or brain fluid. These were identified in 69% of participants with cognitive PASC, compared with 0% of cognitive controls (P = .03).

“When we find this pattern in both blood and brain, it suggests a systemic inflammatory disorder,” although “we have no idea what these antibodies are targeting,” said Dr. Hellmuth.

The study represents “the very beginning stages” of PASC becoming a medical diagnosis “where doctors know what to call it, how to treat it, and how to do blood and cerebrospinal fluid tests to diagnose it,” said Dr. Hellmuth.

She hopes PASC will receive medical legitimacy just as TBI has. In years past, a player was hit on the head or had their “bell rung,” simply returned to the field. “Now that we understand the science, we call it a mild TBI or concussion, and we have a very different medical approach to it.”

A limitation of the study was the small sample size, which may hinder the results’ validity. In addition, the study demographics may not reflect the broader population of those impacted by PASC.
 

‘A first substantial step’

Commenting on the research, William Schaffner, MD, professor, division of infectious diseases, Vanderbilt University Medical Center, Nashville, Tenn., said the new results represent “a first substantial step on the road to trying to find out what’s going on” with COVID patients dealing with cognitive issues.

Dr. Schaffner noted that elevated protein levels, identified in some study subjects, “is usually a consequence of previous inflammation” and is “a very interesting” finding. “In people who are otherwise normal, if you do a lumbar puncture, you don’t find elevated proteins.”

However, he noted the “diversity of results” from CSF examinations. “A single pattern does not leap out.”

What the researchers are observing “is not just a phenomenon of the mind or just something psychological,” said Dr. Schaffner. “Something physical is going on here.”

The study was funded by grants from the National Institute of Mental Health and the National Institute of Neurological Disorders and Stroke. Dr. Hellmuth received grant support from the National Institutes of Health/NIMH supporting this work and personal fees for medical-legal consultation outside of the submitted work. Dr. Schaffner has disclosed not relevant financial relationships.

A version of this article first appeared on Medscape.com.

Impaired cognition associated with COVID-19 appears to have a biological versus psychological basis, early research suggests. Investigators found abnormalities in cerebrospinal fluid (CSF) and other risk factors, including diabetes and hypertension, present in individuals with mild COVID-19 experiencing persistent cognitive problems, often referred to as “brain fog.”

“We’re seeing changes to the [CSF] in the brain of most people who report cognitive changes,” said Joanna Hellmuth, MD, assistant professor of neurology, Memory and Aging Center, University of California, San Francisco. “We’re just in the beginning stages, but I hope this study will provide some legitimacy to this being a true neurologic condition.”

The study was published online Jan. 18, 2022, in Annals of Clinical and Translational Neurology.
 

No guidance

There is currently no guidance on how to identify patients with COVID-related cognitive changes, said Dr. Hellmuth. “The term ‘brain fog’ is not based in science or medicine, but that’s the most common term we use to describe this.”

The analysis included adults with confirmed SARS-CoV-2 infection not requiring hospitalization who were enrolled in the Long-term Impact of Infection with Novel Coronavirus study.

Participants underwent a structured interview that covered COVID-19 illness, past medical history, preexisting cognitive risk factors, medications, and cognitive symptoms following onset of COVID-19. They also completed an in-person battery of cognitive tests.

The analysis included 22 participants with at least one new cognitive symptom who had cognitive post-acute sequelae of SARS-CoV-2 infection (PASC). Ten cognitive controls reported no new cognitive symptoms after acute infection.

Participants were a median age of 41 years, had a median of 16 years of education, and were assessed a median of 10.1 months from their first COVID-19 symptom. There were no group differences in terms of age, gender, years of education, or distribution of race/ethnicity (all P > .05).

Among those with cognitive PASC, 43% reported cognitive symptoms starting 1 or more months after the first COVID symptom. About 29% reported cognitive changes started 2 or more months after their first COVID symptom.

“The immune system could be altered in some way after the infection, and perhaps that’s what’s contributing to these delayed onset cognitive changes,” said Dr. Hellmuth.

Compared with controls, participants with cognitive PASC had more preexisting cognitive risk factors (a median of 2.5 vs. 0; P = .03). These included hypertension and diabetes, which increase the risk of stroke, mild cognitive impairment, vascular dementia, traumatic brain injury, (TBI), learning disabilities, anxiety, depression, stimulant use, and ADHD, which may make the brain more vulnerable to executive functioning problems.

Dr. Hellmuth noted that the study wasn’t powered to determine whether any individual risk factor was associated with risk of cognitive changes.

As there are no published neuropsychological testing criteria for cognitive PASC, the researchers applied the equivalent criteria for HIV-associated neurocognitive disorder (HAND), a similar, virally associated cognitive disorder. Only 59% of those with cognitive PASC met equivalent HAND criteria for objective cognitive impairment versus 70% of cognitive controls. This, the investigators noted, highlights “the challenges and incongruities of using subjective, versus objective cognitive assessments for diagnosis.”
 

Is self-report enough?

While there is currently “nothing objective doctors can hang their hats on to say ‘you do’ or ‘you don’t’ have cognitive changes related to COVID,” using the HAND criteria is “not particularly helpful,” said Dr. Hellmuth. “Comparing an individual to a population-based norm in this case is really nuanced, and we shouldn’t rely on this solely to determine whether they do, or don’t, have cognitive changes.”

Perhaps self-reports in this case are “enough” said Dr. Hellmuth. “People know their brains better than anyone else, better than any doctor will.”

A total of 13 in the cognitive PASC group and 4 in the control group consented to a lumbar puncture. Cognitive PASC participants were older than controls (median of 47 vs. 28 years; P = .03) with no other between-group differences.

Overall, 77% of participants with cognitive PASC had a CSF abnormality, compared with 0% of cognitive controls (P = .01). CSF abnormalities included elevated protein levels with no other explainable cause in 2 of the 13 subjects with PASC, which Dr. Hellmuth said is typically a marker of inflammation.

Researchers also noted abnormal oligoclonal banding, a collection of antibodies, in the blood or brain fluid. These were identified in 69% of participants with cognitive PASC, compared with 0% of cognitive controls (P = .03).

“When we find this pattern in both blood and brain, it suggests a systemic inflammatory disorder,” although “we have no idea what these antibodies are targeting,” said Dr. Hellmuth.

The study represents “the very beginning stages” of PASC becoming a medical diagnosis “where doctors know what to call it, how to treat it, and how to do blood and cerebrospinal fluid tests to diagnose it,” said Dr. Hellmuth.

She hopes PASC will receive medical legitimacy just as TBI has. In years past, a player was hit on the head or had their “bell rung,” simply returned to the field. “Now that we understand the science, we call it a mild TBI or concussion, and we have a very different medical approach to it.”

A limitation of the study was the small sample size, which may hinder the results’ validity. In addition, the study demographics may not reflect the broader population of those impacted by PASC.
 

‘A first substantial step’

Commenting on the research, William Schaffner, MD, professor, division of infectious diseases, Vanderbilt University Medical Center, Nashville, Tenn., said the new results represent “a first substantial step on the road to trying to find out what’s going on” with COVID patients dealing with cognitive issues.

Dr. Schaffner noted that elevated protein levels, identified in some study subjects, “is usually a consequence of previous inflammation” and is “a very interesting” finding. “In people who are otherwise normal, if you do a lumbar puncture, you don’t find elevated proteins.”

However, he noted the “diversity of results” from CSF examinations. “A single pattern does not leap out.”

What the researchers are observing “is not just a phenomenon of the mind or just something psychological,” said Dr. Schaffner. “Something physical is going on here.”

The study was funded by grants from the National Institute of Mental Health and the National Institute of Neurological Disorders and Stroke. Dr. Hellmuth received grant support from the National Institutes of Health/NIMH supporting this work and personal fees for medical-legal consultation outside of the submitted work. Dr. Schaffner has disclosed not relevant financial relationships.

A version of this article first appeared on Medscape.com.

Disruption of the bacteria in the gut is linked with susceptibility to long COVID-19 syndrome, according to new findings.

While links have been found between the gut’s microbiome and COVID-19, as well as other diseases, this is the first published research to show a link specifically to COVID’s long-term effects, the investigators, based at the Chinese University of Hong Kong, wrote in Gut.

Courtesy Dr. Siew Ng

“To our knowledge, this is the first study to show that altered gut microbiome composition is strongly associated with persistent symptoms in patients with COVID-19 up to 6 months after clearance of SARS-CoV-2 virus,” said Siew Ng, MBBS, PhD, associate director at the university’s Center for Gut Microbiota Research.

At three hospitals, the researchers enrolled 106 patients with COVID-19 from February to August 2020 with stool samples at admission and at 1 month and 6 months after discharge, and compared them with people who did not have COVID, recruited in 2019. The severity of COVID in the enrolled patients was mostly mild to moderate.

At 3 months, 86 of the patients with COVID had post–acute COVID-19 syndrome (PACS) – defined as at least one persistent, otherwise unexplained symptom 4 weeks after clearance of the virus. And 81 patients had PACS at 6 months, most commonly fatigue, poor memory, hair loss, anxiety, and trouble sleeping.

Using stool samples for their analysis, the researchers found that, broadly, the diversity of the types of bacteria, and the abundance of these bacteria, were significantly lower at 6 months for those with PACS, compared with those without PACS and with controls (P < .05 and P < .0001, respectively). Among those with PACS, 28 bacteria species were diminished and 14 were enriched, both at baseline and follow-up. Those patients who had COVID but not PACS showed just 25 alterations of bacteria species at the time of hospital admission, and they all normalized by 6 months.

Having respiratory symptoms at 6 months was linked with higher levels of opportunistic pathogens such as Streptococcus anginosus and S. vestibularis. Neuropsychiatric symptoms and fatigue were associated with nosocomial pathogens that are linked to opportunistic infections, such as Clostridium innocuum and Actinomyces naeslundii (P < .05).

Bacteria known for producing butyrate, a beneficial fatty acid, were significantly depleted in those patients with hair loss. And certain of these bacteria, including Bifidobacterium pseudocatenulatum and Faecalibacterium prausnitzii, had the largest inverse correlations with PACS at 6 months (P < .05), the researchers found.

“Particular gut microbial profiles may indicate heightened susceptibility,” Dr. Ng said.

Although the findings were drawn from patients with earlier strains of the COVID-19 virus, the findings still apply to new variants, including Omicron, since these pose the same problem of persistent disruption of the immune system, Dr. Ng said.

Her group is conducting trials to look at how modulating the microbiome might prevent long COVID and boost antibodies after vaccination in high-risk people, she said.

“Gut microbiota influences the health of the host,” Dr. Ng said. “It provides crucial benefits in the form of immune system development, prevention of infections, nutrient acquisition, and brain and nervous system functionality. Considering the millions of people infected during the ongoing pandemic, our findings are a strong impetus for consideration of microbiota modulation to facilitate timely recovery and reduce the burden of post–acute COVID-19 syndrome.”

Courtesy Dr. John Haran

John Haran, MD, PhD, associate professor of microbiology and physiological systems and emergency medicine at the University of Massachusetts, Worcester, said the research adds to the evidence base on the gut microbiome’s links to COVID, but there was likely be no clinical impact yet. Still, he said the findings linking specific species to specific symptoms was particularly interesting.

“Very early on during hospitalization, [the researchers] saw these differences and correlated out with people who have longer symptoms, and especially different groups of people that have longer symptoms, too,” said Dr. Haran, who has done research on the topic. “It’s very different if you have different symptoms, for example, you keep coughing for months versus you have brain fog and fatigue, or other debilitating symptoms.”

Dr. Haran noted that the findings didn’t identify bacteria types especially linked to COVID, but rather species that have already been found to be associated with a “bad” microbiome. He also pointed out that the patients enrolled in the study were not vaccinated, because vaccines weren’t available at the time. Still, further study to see whether modulation of gut bacteria can be a therapy seems worthwhile.

“Microbiome modulation is pretty safe, and that’s really the next big step that needs to be taken in this,” he said.

For now, the findings don’t give the clinician much new ammunition for treatment.

“We’re not there yet,” he added. “It’s not as if clinicians are going to tell their COVID patients: ‘Go out and buy some kale.’ ”

Eugene Chang, MD, professor of medicine at the University of Chicago, who has studied the gut microbiome and gastrointestinal disease, said it’s “too preliminary” to say whether the findings could lead to a clinical impact. The measures used merely identify the microbes present, but not what they are doing.

“These measures are unlikely to perform well enough to be useful for risk assessment or predicting clinical outcomes,” he said. “That being said, advances in technology are being made where next generations of metrics could be developed and useful as stratifiers and predictors of risk.”

Seeing shifting patterns associated with certain symptoms, he said, is “notable because it suggests that the disturbances of the gut microbiota in PACS are significant.”

But he said it’s important to know whether these changes are a cause of PACS in some way or just an effect of it.

“If causative or contributory – this has to be proven – then ‘microbiota modulation’ would make sense and could be a priority for development,” he said. “If merely an effect, these metrics and better ones to come could be useful as predictors or measures of the patient’s general state of health.”

As seen in his group’s work and other work, he said, “the gut microbiota is highly sensitive to changes in their ecosystem, which is influenced by the health state of the patient.”

Dr. Ng, Dr. Haran, and Dr. Chang reported no relevant disclosures.

This article was updated Jan. 27, 2022.

Disruption of the bacteria in the gut is linked with susceptibility to long COVID-19 syndrome, according to new findings.

While links have been found between the gut’s microbiome and COVID-19, as well as other diseases, this is the first published research to show a link specifically to COVID’s long-term effects, the investigators, based at the Chinese University of Hong Kong, wrote in Gut.

Courtesy Dr. Siew Ng

“To our knowledge, this is the first study to show that altered gut microbiome composition is strongly associated with persistent symptoms in patients with COVID-19 up to 6 months after clearance of SARS-CoV-2 virus,” said Siew Ng, MBBS, PhD, associate director at the university’s Center for Gut Microbiota Research.

At three hospitals, the researchers enrolled 106 patients with COVID-19 from February to August 2020 with stool samples at admission and at 1 month and 6 months after discharge, and compared them with people who did not have COVID, recruited in 2019. The severity of COVID in the enrolled patients was mostly mild to moderate.

At 3 months, 86 of the patients with COVID had post–acute COVID-19 syndrome (PACS) – defined as at least one persistent, otherwise unexplained symptom 4 weeks after clearance of the virus. And 81 patients had PACS at 6 months, most commonly fatigue, poor memory, hair loss, anxiety, and trouble sleeping.

Using stool samples for their analysis, the researchers found that, broadly, the diversity of the types of bacteria, and the abundance of these bacteria, were significantly lower at 6 months for those with PACS, compared with those without PACS and with controls (P < .05 and P < .0001, respectively). Among those with PACS, 28 bacteria species were diminished and 14 were enriched, both at baseline and follow-up. Those patients who had COVID but not PACS showed just 25 alterations of bacteria species at the time of hospital admission, and they all normalized by 6 months.

Having respiratory symptoms at 6 months was linked with higher levels of opportunistic pathogens such as Streptococcus anginosus and S. vestibularis. Neuropsychiatric symptoms and fatigue were associated with nosocomial pathogens that are linked to opportunistic infections, such as Clostridium innocuum and Actinomyces naeslundii (P < .05).

Bacteria known for producing butyrate, a beneficial fatty acid, were significantly depleted in those patients with hair loss. And certain of these bacteria, including Bifidobacterium pseudocatenulatum and Faecalibacterium prausnitzii, had the largest inverse correlations with PACS at 6 months (P < .05), the researchers found.

“Particular gut microbial profiles may indicate heightened susceptibility,” Dr. Ng said.

Although the findings were drawn from patients with earlier strains of the COVID-19 virus, the findings still apply to new variants, including Omicron, since these pose the same problem of persistent disruption of the immune system, Dr. Ng said.

Her group is conducting trials to look at how modulating the microbiome might prevent long COVID and boost antibodies after vaccination in high-risk people, she said.

“Gut microbiota influences the health of the host,” Dr. Ng said. “It provides crucial benefits in the form of immune system development, prevention of infections, nutrient acquisition, and brain and nervous system functionality. Considering the millions of people infected during the ongoing pandemic, our findings are a strong impetus for consideration of microbiota modulation to facilitate timely recovery and reduce the burden of post–acute COVID-19 syndrome.”

Courtesy Dr. John Haran

John Haran, MD, PhD, associate professor of microbiology and physiological systems and emergency medicine at the University of Massachusetts, Worcester, said the research adds to the evidence base on the gut microbiome’s links to COVID, but there was likely be no clinical impact yet. Still, he said the findings linking specific species to specific symptoms was particularly interesting.

“Very early on during hospitalization, [the researchers] saw these differences and correlated out with people who have longer symptoms, and especially different groups of people that have longer symptoms, too,” said Dr. Haran, who has done research on the topic. “It’s very different if you have different symptoms, for example, you keep coughing for months versus you have brain fog and fatigue, or other debilitating symptoms.”

Dr. Haran noted that the findings didn’t identify bacteria types especially linked to COVID, but rather species that have already been found to be associated with a “bad” microbiome. He also pointed out that the patients enrolled in the study were not vaccinated, because vaccines weren’t available at the time. Still, further study to see whether modulation of gut bacteria can be a therapy seems worthwhile.

“Microbiome modulation is pretty safe, and that’s really the next big step that needs to be taken in this,” he said.

For now, the findings don’t give the clinician much new ammunition for treatment.

“We’re not there yet,” he added. “It’s not as if clinicians are going to tell their COVID patients: ‘Go out and buy some kale.’ ”

Eugene Chang, MD, professor of medicine at the University of Chicago, who has studied the gut microbiome and gastrointestinal disease, said it’s “too preliminary” to say whether the findings could lead to a clinical impact. The measures used merely identify the microbes present, but not what they are doing.

“These measures are unlikely to perform well enough to be useful for risk assessment or predicting clinical outcomes,” he said. “That being said, advances in technology are being made where next generations of metrics could be developed and useful as stratifiers and predictors of risk.”

Seeing shifting patterns associated with certain symptoms, he said, is “notable because it suggests that the disturbances of the gut microbiota in PACS are significant.”

But he said it’s important to know whether these changes are a cause of PACS in some way or just an effect of it.

“If causative or contributory – this has to be proven – then ‘microbiota modulation’ would make sense and could be a priority for development,” he said. “If merely an effect, these metrics and better ones to come could be useful as predictors or measures of the patient’s general state of health.”

As seen in his group’s work and other work, he said, “the gut microbiota is highly sensitive to changes in their ecosystem, which is influenced by the health state of the patient.”

Dr. Ng, Dr. Haran, and Dr. Chang reported no relevant disclosures.

This article was updated Jan. 27, 2022.

Disruption of the bacteria in the gut is linked with susceptibility to long COVID-19 syndrome, according to new findings.

While links have been found between the gut’s microbiome and COVID-19, as well as other diseases, this is the first published research to show a link specifically to COVID’s long-term effects, the investigators, based at the Chinese University of Hong Kong, wrote in Gut.

Courtesy Dr. Siew Ng

“To our knowledge, this is the first study to show that altered gut microbiome composition is strongly associated with persistent symptoms in patients with COVID-19 up to 6 months after clearance of SARS-CoV-2 virus,” said Siew Ng, MBBS, PhD, associate director at the university’s Center for Gut Microbiota Research.

At three hospitals, the researchers enrolled 106 patients with COVID-19 from February to August 2020 with stool samples at admission and at 1 month and 6 months after discharge, and compared them with people who did not have COVID, recruited in 2019. The severity of COVID in the enrolled patients was mostly mild to moderate.

At 3 months, 86 of the patients with COVID had post–acute COVID-19 syndrome (PACS) – defined as at least one persistent, otherwise unexplained symptom 4 weeks after clearance of the virus. And 81 patients had PACS at 6 months, most commonly fatigue, poor memory, hair loss, anxiety, and trouble sleeping.

Using stool samples for their analysis, the researchers found that, broadly, the diversity of the types of bacteria, and the abundance of these bacteria, were significantly lower at 6 months for those with PACS, compared with those without PACS and with controls (P < .05 and P < .0001, respectively). Among those with PACS, 28 bacteria species were diminished and 14 were enriched, both at baseline and follow-up. Those patients who had COVID but not PACS showed just 25 alterations of bacteria species at the time of hospital admission, and they all normalized by 6 months.

Having respiratory symptoms at 6 months was linked with higher levels of opportunistic pathogens such as Streptococcus anginosus and S. vestibularis. Neuropsychiatric symptoms and fatigue were associated with nosocomial pathogens that are linked to opportunistic infections, such as Clostridium innocuum and Actinomyces naeslundii (P < .05).

Bacteria known for producing butyrate, a beneficial fatty acid, were significantly depleted in those patients with hair loss. And certain of these bacteria, including Bifidobacterium pseudocatenulatum and Faecalibacterium prausnitzii, had the largest inverse correlations with PACS at 6 months (P < .05), the researchers found.

“Particular gut microbial profiles may indicate heightened susceptibility,” Dr. Ng said.

Although the findings were drawn from patients with earlier strains of the COVID-19 virus, the findings still apply to new variants, including Omicron, since these pose the same problem of persistent disruption of the immune system, Dr. Ng said.

Her group is conducting trials to look at how modulating the microbiome might prevent long COVID and boost antibodies after vaccination in high-risk people, she said.

“Gut microbiota influences the health of the host,” Dr. Ng said. “It provides crucial benefits in the form of immune system development, prevention of infections, nutrient acquisition, and brain and nervous system functionality. Considering the millions of people infected during the ongoing pandemic, our findings are a strong impetus for consideration of microbiota modulation to facilitate timely recovery and reduce the burden of post–acute COVID-19 syndrome.”

Courtesy Dr. John Haran

John Haran, MD, PhD, associate professor of microbiology and physiological systems and emergency medicine at the University of Massachusetts, Worcester, said the research adds to the evidence base on the gut microbiome’s links to COVID, but there was likely be no clinical impact yet. Still, he said the findings linking specific species to specific symptoms was particularly interesting.

“Very early on during hospitalization, [the researchers] saw these differences and correlated out with people who have longer symptoms, and especially different groups of people that have longer symptoms, too,” said Dr. Haran, who has done research on the topic. “It’s very different if you have different symptoms, for example, you keep coughing for months versus you have brain fog and fatigue, or other debilitating symptoms.”

Dr. Haran noted that the findings didn’t identify bacteria types especially linked to COVID, but rather species that have already been found to be associated with a “bad” microbiome. He also pointed out that the patients enrolled in the study were not vaccinated, because vaccines weren’t available at the time. Still, further study to see whether modulation of gut bacteria can be a therapy seems worthwhile.

“Microbiome modulation is pretty safe, and that’s really the next big step that needs to be taken in this,” he said.

For now, the findings don’t give the clinician much new ammunition for treatment.

“We’re not there yet,” he added. “It’s not as if clinicians are going to tell their COVID patients: ‘Go out and buy some kale.’ ”

Eugene Chang, MD, professor of medicine at the University of Chicago, who has studied the gut microbiome and gastrointestinal disease, said it’s “too preliminary” to say whether the findings could lead to a clinical impact. The measures used merely identify the microbes present, but not what they are doing.

“These measures are unlikely to perform well enough to be useful for risk assessment or predicting clinical outcomes,” he said. “That being said, advances in technology are being made where next generations of metrics could be developed and useful as stratifiers and predictors of risk.”

Seeing shifting patterns associated with certain symptoms, he said, is “notable because it suggests that the disturbances of the gut microbiota in PACS are significant.”

But he said it’s important to know whether these changes are a cause of PACS in some way or just an effect of it.

“If causative or contributory – this has to be proven – then ‘microbiota modulation’ would make sense and could be a priority for development,” he said. “If merely an effect, these metrics and better ones to come could be useful as predictors or measures of the patient’s general state of health.”

As seen in his group’s work and other work, he said, “the gut microbiota is highly sensitive to changes in their ecosystem, which is influenced by the health state of the patient.”

Dr. Ng, Dr. Haran, and Dr. Chang reported no relevant disclosures.

This article was updated Jan. 27, 2022.

Postacute COVID syndrome (PACS), an ongoing inflammatory state following infection with SARS-CoV-2, is associated with greater risk of metabolic-associated fatty liver disease (MAFLD), according to an analysis of patients at a single clinic in Canada published in Open Forum Infectious Diseases.

MAFLD, also known as nonalcoholic fatty liver disease (NAFLD), is considered an indicator of general health and is in turn linked to greater risk of cardiovascular complications and mortality. It may be a multisystem disorder with various underlying causes.

Postacute COVID syndrome (PACS), an ongoing inflammatory state following infection with SARS-CoV-2, is associated with greater risk of metabolic-associated fatty liver disease (MAFLD), according to an analysis of patients at a single clinic in Canada published in Open Forum Infectious Diseases.

MAFLD, also known as nonalcoholic fatty liver disease (NAFLD), is considered an indicator of general health and is in turn linked to greater risk of cardiovascular complications and mortality. It may be a multisystem disorder with various underlying causes.

Postacute COVID syndrome (PACS), an ongoing inflammatory state following infection with SARS-CoV-2, is associated with greater risk of metabolic-associated fatty liver disease (MAFLD), according to an analysis of patients at a single clinic in Canada published in Open Forum Infectious Diseases.

MAFLD, also known as nonalcoholic fatty liver disease (NAFLD), is considered an indicator of general health and is in turn linked to greater risk of cardiovascular complications and mortality. It may be a multisystem disorder with various underlying causes.