Vaccines

TOPLINE:

A single dose of the recombinant respiratory syncytial virus (RSV) vaccine demonstrates effectiveness against infections and associated hospitalizations in veterans aged 60 years or older during the 2023-2024 respiratory illness season. This protection extends across age groups and immunocompromised individuals.

METHODOLOGY:

• Researchers conducted a target trial emulation study to evaluate the real-world effectiveness of a single dose of recombinant RSV vaccine (RSVPreF3 or RSVpreF) among veterans enrolled in the Veterans Health Administration in the United States between September 1 and December 31, 2023.

• They analyzed 146,852 vaccinated veterans (69.2%, RSVPreF; 29.9%, RSVPreF3) propensity matched with 582,936 unvaccinated ones (median age, ~76 years; ~94% men; immunocompromised individuals, 11.2%) who were followed up for a median of 124 days.

• The primary outcome was any positive RSV test result obtained from day 14 after vaccination.

• The secondary outcomes were RSV-associated emergency department or urgent care visits, hospitalizations, intensive care unit (ICU) admissions, and death.

TAKEAWAY:

• Vaccine effectiveness against documented RSV infections was 78.1% (95% CI, 72.6-83.5), with incidence rates of infections lower in the vaccinated group than in the unvaccinated group (1.7 vs 7.3 per 1000 person-years).

• Likewise, vaccine effectiveness against RSV-associated emergency department or urgent care visits was 78.7% (95% CI, 72.2-84.8), with rates of infections lower in the vaccinated group than in the unvaccinated group (1.3 vs 5.7 per 1000 person-years).

• Immunocompromised veterans demonstrated a lower vaccine effectiveness of 71.6% (95% CI, 55.4-85.2); however, infection rates remained lower in the vaccinated group than in the unvaccinated group (5.8 vs 19.9 per 1000 person-years).

• Hospitalizations, ICU admission rates, and mortality rates were also lower in the vaccinated group than in the unvaccinated group.

IN PRACTICE:

“These results give confidence that an RSV vaccine for older adults is likely to provide protection against RSV infection and RSV disease, at least in the first season following vaccination,” wrote the author of an accompanying comment.

SOURCE:

The study was funded by the US Department of Veterans Affairs Cooperative Studies Program. It was published online on January 20, 2025, in The Lancet Infectious Diseases (2025 Jan 20. doi:10.1016/S1473-3099(24)00796-5)

LIMITATIONS:

This study did not account for veterans who sought care outside of the Veterans Health Administration. While the study employed rigorous matching to ensure the similarity of demographic, geographic, and clinical characteristics, there could still have been residual confounding. Also, the study was not designed to estimate the protective effect of the vaccine against mild RSV illness.

DISCLOSURES:

This study was supported by the US Department of Veterans Affairs Cooperative Studies Program and funded in part by the US Department of Health and Human Services Biomedical Advanced Research and Development Authority and US Food and Drug Administration. One of the authors reported receiving consulting support from Van-Breemen & Hynes and having a subcontract at Oregon State University for a Patient-Centered Outcomes Research Institute grant. Others reported no conflicts of interest.■

This article was created using several editorial tools, including AI, as part of the process. Human editors reviewed this content before publication.

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

TOPLINE:

A single dose of the recombinant respiratory syncytial virus (RSV) vaccine demonstrates effectiveness against infections and associated hospitalizations in veterans aged 60 years or older during the 2023-2024 respiratory illness season. This protection extends across age groups and immunocompromised individuals.

METHODOLOGY:

• Researchers conducted a target trial emulation study to evaluate the real-world effectiveness of a single dose of recombinant RSV vaccine (RSVPreF3 or RSVpreF) among veterans enrolled in the Veterans Health Administration in the United States between September 1 and December 31, 2023.

• They analyzed 146,852 vaccinated veterans (69.2%, RSVPreF; 29.9%, RSVPreF3) propensity matched with 582,936 unvaccinated ones (median age, ~76 years; ~94% men; immunocompromised individuals, 11.2%) who were followed up for a median of 124 days.

• The primary outcome was any positive RSV test result obtained from day 14 after vaccination.

• The secondary outcomes were RSV-associated emergency department or urgent care visits, hospitalizations, intensive care unit (ICU) admissions, and death.

TAKEAWAY:

• Vaccine effectiveness against documented RSV infections was 78.1% (95% CI, 72.6-83.5), with incidence rates of infections lower in the vaccinated group than in the unvaccinated group (1.7 vs 7.3 per 1000 person-years).

• Likewise, vaccine effectiveness against RSV-associated emergency department or urgent care visits was 78.7% (95% CI, 72.2-84.8), with rates of infections lower in the vaccinated group than in the unvaccinated group (1.3 vs 5.7 per 1000 person-years).

• Immunocompromised veterans demonstrated a lower vaccine effectiveness of 71.6% (95% CI, 55.4-85.2); however, infection rates remained lower in the vaccinated group than in the unvaccinated group (5.8 vs 19.9 per 1000 person-years).

• Hospitalizations, ICU admission rates, and mortality rates were also lower in the vaccinated group than in the unvaccinated group.

IN PRACTICE:

“These results give confidence that an RSV vaccine for older adults is likely to provide protection against RSV infection and RSV disease, at least in the first season following vaccination,” wrote the author of an accompanying comment.

SOURCE:

The study was funded by the US Department of Veterans Affairs Cooperative Studies Program. It was published online on January 20, 2025, in The Lancet Infectious Diseases (2025 Jan 20. doi:10.1016/S1473-3099(24)00796-5)

LIMITATIONS:

This study did not account for veterans who sought care outside of the Veterans Health Administration. While the study employed rigorous matching to ensure the similarity of demographic, geographic, and clinical characteristics, there could still have been residual confounding. Also, the study was not designed to estimate the protective effect of the vaccine against mild RSV illness.

DISCLOSURES:

This study was supported by the US Department of Veterans Affairs Cooperative Studies Program and funded in part by the US Department of Health and Human Services Biomedical Advanced Research and Development Authority and US Food and Drug Administration. One of the authors reported receiving consulting support from Van-Breemen & Hynes and having a subcontract at Oregon State University for a Patient-Centered Outcomes Research Institute grant. Others reported no conflicts of interest.■

This article was created using several editorial tools, including AI, as part of the process. Human editors reviewed this content before publication.

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

TOPLINE:

A single dose of the recombinant respiratory syncytial virus (RSV) vaccine demonstrates effectiveness against infections and associated hospitalizations in veterans aged 60 years or older during the 2023-2024 respiratory illness season. This protection extends across age groups and immunocompromised individuals.

METHODOLOGY:

• Researchers conducted a target trial emulation study to evaluate the real-world effectiveness of a single dose of recombinant RSV vaccine (RSVPreF3 or RSVpreF) among veterans enrolled in the Veterans Health Administration in the United States between September 1 and December 31, 2023.

• They analyzed 146,852 vaccinated veterans (69.2%, RSVPreF; 29.9%, RSVPreF3) propensity matched with 582,936 unvaccinated ones (median age, ~76 years; ~94% men; immunocompromised individuals, 11.2%) who were followed up for a median of 124 days.

• The primary outcome was any positive RSV test result obtained from day 14 after vaccination.

• The secondary outcomes were RSV-associated emergency department or urgent care visits, hospitalizations, intensive care unit (ICU) admissions, and death.

TAKEAWAY:

• Vaccine effectiveness against documented RSV infections was 78.1% (95% CI, 72.6-83.5), with incidence rates of infections lower in the vaccinated group than in the unvaccinated group (1.7 vs 7.3 per 1000 person-years).

• Likewise, vaccine effectiveness against RSV-associated emergency department or urgent care visits was 78.7% (95% CI, 72.2-84.8), with rates of infections lower in the vaccinated group than in the unvaccinated group (1.3 vs 5.7 per 1000 person-years).

• Immunocompromised veterans demonstrated a lower vaccine effectiveness of 71.6% (95% CI, 55.4-85.2); however, infection rates remained lower in the vaccinated group than in the unvaccinated group (5.8 vs 19.9 per 1000 person-years).

• Hospitalizations, ICU admission rates, and mortality rates were also lower in the vaccinated group than in the unvaccinated group.

IN PRACTICE:

“These results give confidence that an RSV vaccine for older adults is likely to provide protection against RSV infection and RSV disease, at least in the first season following vaccination,” wrote the author of an accompanying comment.

SOURCE:

The study was funded by the US Department of Veterans Affairs Cooperative Studies Program. It was published online on January 20, 2025, in The Lancet Infectious Diseases (2025 Jan 20. doi:10.1016/S1473-3099(24)00796-5)

LIMITATIONS:

This study did not account for veterans who sought care outside of the Veterans Health Administration. While the study employed rigorous matching to ensure the similarity of demographic, geographic, and clinical characteristics, there could still have been residual confounding. Also, the study was not designed to estimate the protective effect of the vaccine against mild RSV illness.

DISCLOSURES:

This study was supported by the US Department of Veterans Affairs Cooperative Studies Program and funded in part by the US Department of Health and Human Services Biomedical Advanced Research and Development Authority and US Food and Drug Administration. One of the authors reported receiving consulting support from Van-Breemen & Hynes and having a subcontract at Oregon State University for a Patient-Centered Outcomes Research Institute grant. Others reported no conflicts of interest.■

This article was created using several editorial tools, including AI, as part of the process. Human editors reviewed this content before publication.

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

This transcript has been edited for clarity. 

I would like to briefly discuss a very interesting paper that appeared in Nature:“Megastudy Shows That Reminders Boost Vaccination but Adding Free Rides Does Not.” 

Obviously, the paper has a provocative title. This is really an excellent example of what one might call implementation research, or quite frankly, what might work and what might not work in terms of having a very pragmatic goal. In this case, it was how do we get people to receive vaccinations. 

This specific study looked at individuals who were scheduled to receive or were candidates to receive COVID-19 booster vaccinations. The question came up: If you gave them free rides to the location — this is obviously a high-risk population — would that increase the vaccination rate vs the other item that they were looking at here, which was potentially texting them to remind them?

The study very importantly and relevantly demonstrated, quite nicely, that offering free rides did not make a difference, but sending texts to remind them increased the 30-day vaccination rate in this population by 21%. 

Again, it was a very pragmatic question that the trial addressed, and one might use this information in the future to increase the vaccination rate of a population where it is critical to do so. This type of research, which involves looking at very pragmatic questions and answering what is the optimal and most cost-effective way of doing it, should be encouraged. 

I encourage you to look at this paper if you’re interested in this topic.

Markman, Professor of Medical Oncology and Therapeutics Research, City of Hope Comprehensive Cancer Center; President, Medicine & Science, City of Hope Atlanta, Chicago, Phoenix, has disclosed ties with GlaxoSmithKline and AstraZeneca.

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

This transcript has been edited for clarity. 

I would like to briefly discuss a very interesting paper that appeared in Nature:“Megastudy Shows That Reminders Boost Vaccination but Adding Free Rides Does Not.” 

Obviously, the paper has a provocative title. This is really an excellent example of what one might call implementation research, or quite frankly, what might work and what might not work in terms of having a very pragmatic goal. In this case, it was how do we get people to receive vaccinations. 

This specific study looked at individuals who were scheduled to receive or were candidates to receive COVID-19 booster vaccinations. The question came up: If you gave them free rides to the location — this is obviously a high-risk population — would that increase the vaccination rate vs the other item that they were looking at here, which was potentially texting them to remind them?

The study very importantly and relevantly demonstrated, quite nicely, that offering free rides did not make a difference, but sending texts to remind them increased the 30-day vaccination rate in this population by 21%. 

Again, it was a very pragmatic question that the trial addressed, and one might use this information in the future to increase the vaccination rate of a population where it is critical to do so. This type of research, which involves looking at very pragmatic questions and answering what is the optimal and most cost-effective way of doing it, should be encouraged. 

I encourage you to look at this paper if you’re interested in this topic.

Markman, Professor of Medical Oncology and Therapeutics Research, City of Hope Comprehensive Cancer Center; President, Medicine & Science, City of Hope Atlanta, Chicago, Phoenix, has disclosed ties with GlaxoSmithKline and AstraZeneca.

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

This transcript has been edited for clarity. 

I would like to briefly discuss a very interesting paper that appeared in Nature:“Megastudy Shows That Reminders Boost Vaccination but Adding Free Rides Does Not.” 

Obviously, the paper has a provocative title. This is really an excellent example of what one might call implementation research, or quite frankly, what might work and what might not work in terms of having a very pragmatic goal. In this case, it was how do we get people to receive vaccinations. 

This specific study looked at individuals who were scheduled to receive or were candidates to receive COVID-19 booster vaccinations. The question came up: If you gave them free rides to the location — this is obviously a high-risk population — would that increase the vaccination rate vs the other item that they were looking at here, which was potentially texting them to remind them?

The study very importantly and relevantly demonstrated, quite nicely, that offering free rides did not make a difference, but sending texts to remind them increased the 30-day vaccination rate in this population by 21%. 

Again, it was a very pragmatic question that the trial addressed, and one might use this information in the future to increase the vaccination rate of a population where it is critical to do so. This type of research, which involves looking at very pragmatic questions and answering what is the optimal and most cost-effective way of doing it, should be encouraged. 

I encourage you to look at this paper if you’re interested in this topic.

Markman, Professor of Medical Oncology and Therapeutics Research, City of Hope Comprehensive Cancer Center; President, Medicine & Science, City of Hope Atlanta, Chicago, Phoenix, has disclosed ties with GlaxoSmithKline and AstraZeneca.

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

Almost 70 years after the discovery of the respiratory syncytial virus (RSV), vaccines and preventive treatments are giving babies a chance to beat the potentially deadly childhood infection.

As doctors turn to monoclonal antibody therapies and governments plan vaccination programs, clinical researchers are asking whether these measures will reduce the spread of the virus. Will fewer babies die from RSV, and fewer children develop permanent wheezing?

Recent studies offer clues.

Fabio Midulla, an associate professor of pediatrics at Sapienza University of Rome in Rome, Italy, said that the pharmaceutical industry is poised to push governments to use vaccines and monoclonal antibodies for even more children. “Such a push might work,” he said at the European Respiratory Society (ERS) 2024 Congress, “given that several studies have already demonstrated that their use can improve outcomes for children who do become infected and reduce societal costs by reducing hospitalizations.”

But Mariëlle WH Pijnenburg, a pulmonary specialist at Erasmus University Rotterdam in the Netherlands, said at the Congress that greater rollout would require governments to force industry to lower prices. If treatments remain beyond the reach of lower-income countries — where the burden of RSV is the greatest — the death toll from this common childhood infection will remain stubbornly high, and the prospect of global elimination will remain forever out of reach, she said.

New Tools in the Fight Against RSV

Nirsevimab, a long-acting monoclonal antibody given to newborns to prevent severe infection, was approved by the European Medicines Agency (EMA) in October 2022 and the US Food and Drug Administration (FDA) in July 2023. And Abrysvo, a vaccine given to older adults and pregnant women to stop them from passing the virus to babies from birth through 6 months of age, was approved by the FDA and the EMA in 2023.

RSV is responsible for over 33 million lung infections in children younger than 5 years annually, with more than 4 million hospitalizations and nearly 200,000 deaths. According to the Centers for Disease Control and Prevention, every year, 2.1 million children younger than 5 years old visit a healthcare provider because of an RSV infection and between 58,000 and 80,000 children younger than 5 years old are hospitalized in the United States. The burden of severe RSV disease is also high among adults, with an estimated 123,000-193,000 hospitalizations, 24,400-34,900 ICU admissions, and 4680-8620 in-hospital deaths occurring annually among US adults.

While the virus affects all age groups, it is particularly severe in infants, swelling their airways and causing them to struggle for breath. Infection in infancy can lead to later complications, such as the development of wheezing, a condition that causes breathlessness and a feeling of tightening in the chest, and possibly also asthma.

Studies have shown that children and preterm infants infected with RSV who were given monoclonal antibodies experienced less post-infection wheezing, suggesting that RSV prophylaxis could prevent the development of wheezing bronchitis.

A study conducted in Galicia, Spain, showed that only 0.3% of infants who received prophylaxis with Nirsevimab were hospitalized for RSV-related lower respiratory tract infections. “This is very promising,” Yvonne Maldonado, MD, professor of pediatrics and epidemiology and population health at Stanford University in Stanford, California, told Medscape Medical News. “But this virus is ubiquitous. It’s found everywhere. It comes around every winter season. And immunity is not long-lasting.”

Older children who are not receiving monoclonal antibodies still experience RSV-related hospitalizations, suggesting the virus continues to circulate at high enough levels in the community. “The vaccine and monoclonal antibodies can reduce the risk of hospitalization and more severe disease in young kids, but they won’t eliminate the virus,” Maldonado said. “Right now, the goal is to prevent serious infection, not to prevent the spread of the virus completely.”

Expanding Access to RSV Prevention in Low-Income Countries

Currently, the RSV vaccine and monoclonal antibodies are only given in the United States, Europe, United Kingdom, and Canada to newborns, children at risk for severe disease, and pregnant women. However, Midulla said that pharmaceutical companies are pushing to broaden the rollout to a broader population within these countries. Yet, he said, over 99% of RSV infection–related deaths occur in the Global South.

No pharmaceutical company has sought approval in low-income countries such as those in Africa. “Unless they see there being a market in a country, they’re not going to go through the onerous process of getting [a vaccine] licensed,” Shabir Madhi, dean of the faculty of health sciences and a professor of vaccinology at the University of the Witwatersrand, Johannesburg, South Africa, told Medscape Medical News.

He highlighted that almost 50% of RSV-related deaths occur in African children younger than 5 years, despite these children comprising just one fifth of the global under-5 population. The high burden of RSV mortality in the Global South is mainly due to poor access to healthcare and supportive treatments, such as supplemental oxygen, which can help children recover from severe RSV infection.

Companies are unlikely to pursue regulatory approval and licensing in low- and middle-income countries until GAVI, the global vaccine alliance, commits to procuring and funding the vaccines for these regions. GAVI’s decision would provide the necessary market incentive for manufacturers to seek approval.

Madhi suggested that GAVI’s decision on RSV vaccine procurement is imminent, likely early next year, following the World Health Organization’s Strategic Advisory Group of Experts on Immunization recommendation to vaccinate all pregnant women with the RSV vaccine, regardless of whether they are in high-income or low-income countries.

Nevertheless, even if vaccines become available, many African countries may still struggle to afford them. Madhi said that these countries would likely depend on GAVI and organizations like UNICEF to procure the vaccines at affordable prices. “The unfortunate reality is that many countries — especially in Africa — still wouldn’t be able to afford it, even if the vaccine cost as little as $5,” said Madhi. “But that’s where they would have the greatest impact.”

Midulla, Pijnenburg reported no relevant financial relationships. Madhi’s research unit, the Vaccines and Infectious Disease Analytics Unit, was involved in the clinical trials for the Pfizer RSV vaccine, the GSK RSV vaccine (which was terminated), as well as the MEDLEY trial of palivizumab. All funding for these studies went to his institution, the University of the Witwatersrand. Maldonado was Stanford principal investigator for the Pfizer RSV vaccine.
 

A version of this article appeared on Medscape.com.

Almost 70 years after the discovery of the respiratory syncytial virus (RSV), vaccines and preventive treatments are giving babies a chance to beat the potentially deadly childhood infection.

As doctors turn to monoclonal antibody therapies and governments plan vaccination programs, clinical researchers are asking whether these measures will reduce the spread of the virus. Will fewer babies die from RSV, and fewer children develop permanent wheezing?

Recent studies offer clues.

Fabio Midulla, an associate professor of pediatrics at Sapienza University of Rome in Rome, Italy, said that the pharmaceutical industry is poised to push governments to use vaccines and monoclonal antibodies for even more children. “Such a push might work,” he said at the European Respiratory Society (ERS) 2024 Congress, “given that several studies have already demonstrated that their use can improve outcomes for children who do become infected and reduce societal costs by reducing hospitalizations.”

But Mariëlle WH Pijnenburg, a pulmonary specialist at Erasmus University Rotterdam in the Netherlands, said at the Congress that greater rollout would require governments to force industry to lower prices. If treatments remain beyond the reach of lower-income countries — where the burden of RSV is the greatest — the death toll from this common childhood infection will remain stubbornly high, and the prospect of global elimination will remain forever out of reach, she said.

New Tools in the Fight Against RSV

Nirsevimab, a long-acting monoclonal antibody given to newborns to prevent severe infection, was approved by the European Medicines Agency (EMA) in October 2022 and the US Food and Drug Administration (FDA) in July 2023. And Abrysvo, a vaccine given to older adults and pregnant women to stop them from passing the virus to babies from birth through 6 months of age, was approved by the FDA and the EMA in 2023.

RSV is responsible for over 33 million lung infections in children younger than 5 years annually, with more than 4 million hospitalizations and nearly 200,000 deaths. According to the Centers for Disease Control and Prevention, every year, 2.1 million children younger than 5 years old visit a healthcare provider because of an RSV infection and between 58,000 and 80,000 children younger than 5 years old are hospitalized in the United States. The burden of severe RSV disease is also high among adults, with an estimated 123,000-193,000 hospitalizations, 24,400-34,900 ICU admissions, and 4680-8620 in-hospital deaths occurring annually among US adults.

While the virus affects all age groups, it is particularly severe in infants, swelling their airways and causing them to struggle for breath. Infection in infancy can lead to later complications, such as the development of wheezing, a condition that causes breathlessness and a feeling of tightening in the chest, and possibly also asthma.

Studies have shown that children and preterm infants infected with RSV who were given monoclonal antibodies experienced less post-infection wheezing, suggesting that RSV prophylaxis could prevent the development of wheezing bronchitis.

A study conducted in Galicia, Spain, showed that only 0.3% of infants who received prophylaxis with Nirsevimab were hospitalized for RSV-related lower respiratory tract infections. “This is very promising,” Yvonne Maldonado, MD, professor of pediatrics and epidemiology and population health at Stanford University in Stanford, California, told Medscape Medical News. “But this virus is ubiquitous. It’s found everywhere. It comes around every winter season. And immunity is not long-lasting.”

Older children who are not receiving monoclonal antibodies still experience RSV-related hospitalizations, suggesting the virus continues to circulate at high enough levels in the community. “The vaccine and monoclonal antibodies can reduce the risk of hospitalization and more severe disease in young kids, but they won’t eliminate the virus,” Maldonado said. “Right now, the goal is to prevent serious infection, not to prevent the spread of the virus completely.”

Expanding Access to RSV Prevention in Low-Income Countries

Currently, the RSV vaccine and monoclonal antibodies are only given in the United States, Europe, United Kingdom, and Canada to newborns, children at risk for severe disease, and pregnant women. However, Midulla said that pharmaceutical companies are pushing to broaden the rollout to a broader population within these countries. Yet, he said, over 99% of RSV infection–related deaths occur in the Global South.

No pharmaceutical company has sought approval in low-income countries such as those in Africa. “Unless they see there being a market in a country, they’re not going to go through the onerous process of getting [a vaccine] licensed,” Shabir Madhi, dean of the faculty of health sciences and a professor of vaccinology at the University of the Witwatersrand, Johannesburg, South Africa, told Medscape Medical News.

He highlighted that almost 50% of RSV-related deaths occur in African children younger than 5 years, despite these children comprising just one fifth of the global under-5 population. The high burden of RSV mortality in the Global South is mainly due to poor access to healthcare and supportive treatments, such as supplemental oxygen, which can help children recover from severe RSV infection.

Companies are unlikely to pursue regulatory approval and licensing in low- and middle-income countries until GAVI, the global vaccine alliance, commits to procuring and funding the vaccines for these regions. GAVI’s decision would provide the necessary market incentive for manufacturers to seek approval.

Madhi suggested that GAVI’s decision on RSV vaccine procurement is imminent, likely early next year, following the World Health Organization’s Strategic Advisory Group of Experts on Immunization recommendation to vaccinate all pregnant women with the RSV vaccine, regardless of whether they are in high-income or low-income countries.

Nevertheless, even if vaccines become available, many African countries may still struggle to afford them. Madhi said that these countries would likely depend on GAVI and organizations like UNICEF to procure the vaccines at affordable prices. “The unfortunate reality is that many countries — especially in Africa — still wouldn’t be able to afford it, even if the vaccine cost as little as $5,” said Madhi. “But that’s where they would have the greatest impact.”

Midulla, Pijnenburg reported no relevant financial relationships. Madhi’s research unit, the Vaccines and Infectious Disease Analytics Unit, was involved in the clinical trials for the Pfizer RSV vaccine, the GSK RSV vaccine (which was terminated), as well as the MEDLEY trial of palivizumab. All funding for these studies went to his institution, the University of the Witwatersrand. Maldonado was Stanford principal investigator for the Pfizer RSV vaccine.
 

A version of this article appeared on Medscape.com.

Almost 70 years after the discovery of the respiratory syncytial virus (RSV), vaccines and preventive treatments are giving babies a chance to beat the potentially deadly childhood infection.

As doctors turn to monoclonal antibody therapies and governments plan vaccination programs, clinical researchers are asking whether these measures will reduce the spread of the virus. Will fewer babies die from RSV, and fewer children develop permanent wheezing?

Recent studies offer clues.

Fabio Midulla, an associate professor of pediatrics at Sapienza University of Rome in Rome, Italy, said that the pharmaceutical industry is poised to push governments to use vaccines and monoclonal antibodies for even more children. “Such a push might work,” he said at the European Respiratory Society (ERS) 2024 Congress, “given that several studies have already demonstrated that their use can improve outcomes for children who do become infected and reduce societal costs by reducing hospitalizations.”

But Mariëlle WH Pijnenburg, a pulmonary specialist at Erasmus University Rotterdam in the Netherlands, said at the Congress that greater rollout would require governments to force industry to lower prices. If treatments remain beyond the reach of lower-income countries — where the burden of RSV is the greatest — the death toll from this common childhood infection will remain stubbornly high, and the prospect of global elimination will remain forever out of reach, she said.

New Tools in the Fight Against RSV

Nirsevimab, a long-acting monoclonal antibody given to newborns to prevent severe infection, was approved by the European Medicines Agency (EMA) in October 2022 and the US Food and Drug Administration (FDA) in July 2023. And Abrysvo, a vaccine given to older adults and pregnant women to stop them from passing the virus to babies from birth through 6 months of age, was approved by the FDA and the EMA in 2023.

RSV is responsible for over 33 million lung infections in children younger than 5 years annually, with more than 4 million hospitalizations and nearly 200,000 deaths. According to the Centers for Disease Control and Prevention, every year, 2.1 million children younger than 5 years old visit a healthcare provider because of an RSV infection and between 58,000 and 80,000 children younger than 5 years old are hospitalized in the United States. The burden of severe RSV disease is also high among adults, with an estimated 123,000-193,000 hospitalizations, 24,400-34,900 ICU admissions, and 4680-8620 in-hospital deaths occurring annually among US adults.

While the virus affects all age groups, it is particularly severe in infants, swelling their airways and causing them to struggle for breath. Infection in infancy can lead to later complications, such as the development of wheezing, a condition that causes breathlessness and a feeling of tightening in the chest, and possibly also asthma.

Studies have shown that children and preterm infants infected with RSV who were given monoclonal antibodies experienced less post-infection wheezing, suggesting that RSV prophylaxis could prevent the development of wheezing bronchitis.

A study conducted in Galicia, Spain, showed that only 0.3% of infants who received prophylaxis with Nirsevimab were hospitalized for RSV-related lower respiratory tract infections. “This is very promising,” Yvonne Maldonado, MD, professor of pediatrics and epidemiology and population health at Stanford University in Stanford, California, told Medscape Medical News. “But this virus is ubiquitous. It’s found everywhere. It comes around every winter season. And immunity is not long-lasting.”

Older children who are not receiving monoclonal antibodies still experience RSV-related hospitalizations, suggesting the virus continues to circulate at high enough levels in the community. “The vaccine and monoclonal antibodies can reduce the risk of hospitalization and more severe disease in young kids, but they won’t eliminate the virus,” Maldonado said. “Right now, the goal is to prevent serious infection, not to prevent the spread of the virus completely.”

Expanding Access to RSV Prevention in Low-Income Countries

Currently, the RSV vaccine and monoclonal antibodies are only given in the United States, Europe, United Kingdom, and Canada to newborns, children at risk for severe disease, and pregnant women. However, Midulla said that pharmaceutical companies are pushing to broaden the rollout to a broader population within these countries. Yet, he said, over 99% of RSV infection–related deaths occur in the Global South.

No pharmaceutical company has sought approval in low-income countries such as those in Africa. “Unless they see there being a market in a country, they’re not going to go through the onerous process of getting [a vaccine] licensed,” Shabir Madhi, dean of the faculty of health sciences and a professor of vaccinology at the University of the Witwatersrand, Johannesburg, South Africa, told Medscape Medical News.

He highlighted that almost 50% of RSV-related deaths occur in African children younger than 5 years, despite these children comprising just one fifth of the global under-5 population. The high burden of RSV mortality in the Global South is mainly due to poor access to healthcare and supportive treatments, such as supplemental oxygen, which can help children recover from severe RSV infection.

Companies are unlikely to pursue regulatory approval and licensing in low- and middle-income countries until GAVI, the global vaccine alliance, commits to procuring and funding the vaccines for these regions. GAVI’s decision would provide the necessary market incentive for manufacturers to seek approval.

Madhi suggested that GAVI’s decision on RSV vaccine procurement is imminent, likely early next year, following the World Health Organization’s Strategic Advisory Group of Experts on Immunization recommendation to vaccinate all pregnant women with the RSV vaccine, regardless of whether they are in high-income or low-income countries.

Nevertheless, even if vaccines become available, many African countries may still struggle to afford them. Madhi said that these countries would likely depend on GAVI and organizations like UNICEF to procure the vaccines at affordable prices. “The unfortunate reality is that many countries — especially in Africa — still wouldn’t be able to afford it, even if the vaccine cost as little as $5,” said Madhi. “But that’s where they would have the greatest impact.”

Midulla, Pijnenburg reported no relevant financial relationships. Madhi’s research unit, the Vaccines and Infectious Disease Analytics Unit, was involved in the clinical trials for the Pfizer RSV vaccine, the GSK RSV vaccine (which was terminated), as well as the MEDLEY trial of palivizumab. All funding for these studies went to his institution, the University of the Witwatersrand. Maldonado was Stanford principal investigator for the Pfizer RSV vaccine.
 

A version of this article appeared on Medscape.com.

An electronic nudge explaining the cardiovascular benefits of the influenza vaccine increased vaccination rates, particularly among people who had previously had a heart attack, showed the NUDGE FLU series of clinical trials.

Influenza has the potential to be a dangerous infection on its own, but it increases the risk for cardiovascular events among people with a history of heart attack, said the study’s lead author, Ankeet Bhatt, MD, a cardiologist at Kaiser Permanente San Francisco Medical Center, San Francisco.

“Yearly influenza vaccines help prevent influenza infection and, in patients with a heart attack, are potentially cardioprotective,” he said during his presentation at the American Heart Association (AHA) Scientific Sessions 2024 in Chicago. The NUDGE FLU results were simultaneously published online in JAMA Cardiology.

In Denmark, where the trials were conducted, about 80% of older adults get flu shots, but only about 40% of younger adults with chronic diseases do, Bhatt reported. In the United States, about 45% of adults and 55% of children received at least one dose of the flu vaccine in the 2023/24 flu season, according to the US Centers for Disease Control and Prevention (CDC).

 

The NUDGE FLU Trials

Bhatt and his colleagues conducted three related clinical trials during the 2022/23 and 2023/24 flu seasons: NUDGE-FLU and NUDGE-FLU-2 targeted older adults, whereas NUDGE-FLU-CHRONIC targeted younger adults with chronic diseases. Nearly 2 million people were involved in the three trials.

Participants were randomized to receive one of a series of different behavioral-science-informed letters, delivered through a government-run electronic communication system, or no reminder.

People who received any of the nudges had higher rates of vaccination; among heart attack survivors, there was a 1.8% improvement and among adults without a history of heart attack, there was a 1.3% improvement. But a nudge that explained the potential cardiovascular benefits of flu shots was even more effective, leading to a 3.9% increase among people with a history of heart attack and a 2% increase among those with no heart attack history.

“A simple sentence resulted in a durable improvement in the vaccination rate,” said Bhatt.

The effect was even greater among those who had not been vaccinated in the previous flu season. Among heart attack survivors, nearly 14% more people got the vaccine compared with just 1.5% more survivors who were previously vaccinated. And it was most effective among younger adults who had experienced a recent heart attack, resulting in a 26% increase.

“The impact was larger in patients with a history of acute myocardial infarction, in those who were vaccine-hesitant, and in younger people” — all groups with the most to gain from vaccination in terms of cardiovascular protection — Bhatt reported.

About 25% of people in the United States are unsure about whether to get a flu shot, said Orly Vardeny, PharmD, professor of medicine at the University of Minnesota Medical School in Minneapolis, who was not involved in the study. The fact that previously unvaccinated people were convinced by the nudges is reassuring. “That’s the group where this intervention is most likely to move the needle,” she said.

Around half of all people hospitalized for flu in the United States have cardiovascular disease, CDC data showed, so “even a small increase in the number of patients who get vaccinated has substantial public health benefits,” Vardeny said.

The NUDGE FLU series showed that nudges like this should be employed as a simple tool to improve vaccination rates, but the system would be much more difficult to implement in the United States, Bhatt said.

Denmark has a national health service and a preexisting government electronic communication system, whereas the US system is privately run and more fractured. It would be possible to make it work, he pointed out, but would take some effort.

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

An electronic nudge explaining the cardiovascular benefits of the influenza vaccine increased vaccination rates, particularly among people who had previously had a heart attack, showed the NUDGE FLU series of clinical trials.

Influenza has the potential to be a dangerous infection on its own, but it increases the risk for cardiovascular events among people with a history of heart attack, said the study’s lead author, Ankeet Bhatt, MD, a cardiologist at Kaiser Permanente San Francisco Medical Center, San Francisco.

“Yearly influenza vaccines help prevent influenza infection and, in patients with a heart attack, are potentially cardioprotective,” he said during his presentation at the American Heart Association (AHA) Scientific Sessions 2024 in Chicago. The NUDGE FLU results were simultaneously published online in JAMA Cardiology.

In Denmark, where the trials were conducted, about 80% of older adults get flu shots, but only about 40% of younger adults with chronic diseases do, Bhatt reported. In the United States, about 45% of adults and 55% of children received at least one dose of the flu vaccine in the 2023/24 flu season, according to the US Centers for Disease Control and Prevention (CDC).

 

The NUDGE FLU Trials

Bhatt and his colleagues conducted three related clinical trials during the 2022/23 and 2023/24 flu seasons: NUDGE-FLU and NUDGE-FLU-2 targeted older adults, whereas NUDGE-FLU-CHRONIC targeted younger adults with chronic diseases. Nearly 2 million people were involved in the three trials.

Participants were randomized to receive one of a series of different behavioral-science-informed letters, delivered through a government-run electronic communication system, or no reminder.

People who received any of the nudges had higher rates of vaccination; among heart attack survivors, there was a 1.8% improvement and among adults without a history of heart attack, there was a 1.3% improvement. But a nudge that explained the potential cardiovascular benefits of flu shots was even more effective, leading to a 3.9% increase among people with a history of heart attack and a 2% increase among those with no heart attack history.

“A simple sentence resulted in a durable improvement in the vaccination rate,” said Bhatt.

The effect was even greater among those who had not been vaccinated in the previous flu season. Among heart attack survivors, nearly 14% more people got the vaccine compared with just 1.5% more survivors who were previously vaccinated. And it was most effective among younger adults who had experienced a recent heart attack, resulting in a 26% increase.

“The impact was larger in patients with a history of acute myocardial infarction, in those who were vaccine-hesitant, and in younger people” — all groups with the most to gain from vaccination in terms of cardiovascular protection — Bhatt reported.

About 25% of people in the United States are unsure about whether to get a flu shot, said Orly Vardeny, PharmD, professor of medicine at the University of Minnesota Medical School in Minneapolis, who was not involved in the study. The fact that previously unvaccinated people were convinced by the nudges is reassuring. “That’s the group where this intervention is most likely to move the needle,” she said.

Around half of all people hospitalized for flu in the United States have cardiovascular disease, CDC data showed, so “even a small increase in the number of patients who get vaccinated has substantial public health benefits,” Vardeny said.

The NUDGE FLU series showed that nudges like this should be employed as a simple tool to improve vaccination rates, but the system would be much more difficult to implement in the United States, Bhatt said.

Denmark has a national health service and a preexisting government electronic communication system, whereas the US system is privately run and more fractured. It would be possible to make it work, he pointed out, but would take some effort.

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

An electronic nudge explaining the cardiovascular benefits of the influenza vaccine increased vaccination rates, particularly among people who had previously had a heart attack, showed the NUDGE FLU series of clinical trials.

Influenza has the potential to be a dangerous infection on its own, but it increases the risk for cardiovascular events among people with a history of heart attack, said the study’s lead author, Ankeet Bhatt, MD, a cardiologist at Kaiser Permanente San Francisco Medical Center, San Francisco.

“Yearly influenza vaccines help prevent influenza infection and, in patients with a heart attack, are potentially cardioprotective,” he said during his presentation at the American Heart Association (AHA) Scientific Sessions 2024 in Chicago. The NUDGE FLU results were simultaneously published online in JAMA Cardiology.

In Denmark, where the trials were conducted, about 80% of older adults get flu shots, but only about 40% of younger adults with chronic diseases do, Bhatt reported. In the United States, about 45% of adults and 55% of children received at least one dose of the flu vaccine in the 2023/24 flu season, according to the US Centers for Disease Control and Prevention (CDC).

 

The NUDGE FLU Trials

Bhatt and his colleagues conducted three related clinical trials during the 2022/23 and 2023/24 flu seasons: NUDGE-FLU and NUDGE-FLU-2 targeted older adults, whereas NUDGE-FLU-CHRONIC targeted younger adults with chronic diseases. Nearly 2 million people were involved in the three trials.

Participants were randomized to receive one of a series of different behavioral-science-informed letters, delivered through a government-run electronic communication system, or no reminder.

People who received any of the nudges had higher rates of vaccination; among heart attack survivors, there was a 1.8% improvement and among adults without a history of heart attack, there was a 1.3% improvement. But a nudge that explained the potential cardiovascular benefits of flu shots was even more effective, leading to a 3.9% increase among people with a history of heart attack and a 2% increase among those with no heart attack history.

“A simple sentence resulted in a durable improvement in the vaccination rate,” said Bhatt.

The effect was even greater among those who had not been vaccinated in the previous flu season. Among heart attack survivors, nearly 14% more people got the vaccine compared with just 1.5% more survivors who were previously vaccinated. And it was most effective among younger adults who had experienced a recent heart attack, resulting in a 26% increase.

“The impact was larger in patients with a history of acute myocardial infarction, in those who were vaccine-hesitant, and in younger people” — all groups with the most to gain from vaccination in terms of cardiovascular protection — Bhatt reported.

About 25% of people in the United States are unsure about whether to get a flu shot, said Orly Vardeny, PharmD, professor of medicine at the University of Minnesota Medical School in Minneapolis, who was not involved in the study. The fact that previously unvaccinated people were convinced by the nudges is reassuring. “That’s the group where this intervention is most likely to move the needle,” she said.

Around half of all people hospitalized for flu in the United States have cardiovascular disease, CDC data showed, so “even a small increase in the number of patients who get vaccinated has substantial public health benefits,” Vardeny said.

The NUDGE FLU series showed that nudges like this should be employed as a simple tool to improve vaccination rates, but the system would be much more difficult to implement in the United States, Bhatt said.

Denmark has a national health service and a preexisting government electronic communication system, whereas the US system is privately run and more fractured. It would be possible to make it work, he pointed out, but would take some effort.

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

Vaccines recommended by the Advisory Committee on Immunization Practices (ACIP) offer important protection against severe illness for pregnant people and their babies.¹ However, vaccination coverage estimates among pregnant people remain suboptimal.^2-5 Additionally, some measures indicate that vaccine hesitancy among pregnant people is increasing; for example, 17.5% of surveyed pregnant women reported being very hesitant about influenza vaccination during pregnancy in 2019-2020, compared with 24.7% in 2022-2023.⁶As fall and winter virus season continues, consider opportunities for you and your staff to help communicate the importance of prenatal vaccination to pregnant patients in your care. Explore updated provider toolkits and prenatal vaccination patient education resources, including fact sheets, social media assets, posters, and short videos on respiratory syncytial virus (RSV), Tdap, COVID-19, influenza, and hepatitis B.

In an interview, CDC’s Haben Debessai, MD, an adjunct instructor in obstetrics and gynecology at Emory School of Medicine, Atlanta, Georgia, contextualizes the data to help healthcare professionals communicate effectively with their pregnant patients. 

 

What can practitioners communicate to patients about why it is important to get vaccinated during their pregnancy?

When communicating with their patients, practitioners can consider opportunities to discuss how vaccines work during pregnancy, emphasizing that prenatal vaccinations are beneficial for both the pregnant person and the fetus. It can be helpful to educate patients on how a pregnant person’s immune system can develop antibodies that will then pass to the fetus during the pregnancy and confer protection during the infant’s early months of life — when they are highly susceptible to illnesses that can be severe, such as RSV-associated lower respiratory tract infections. It can also be useful to discuss pregnancy’s impact on the immune system, which contributes to pregnant people being at higher risk for severe illness from infections like COVID-19 and flu, if contracted. The outcomes of severe illness can be dire for both the pregnant person and their pregnancy, which is why vaccination is the best mitigation option. It can also be beneficial to share with patients that some vaccines, like RSV and Tdap, are specifically for neonatal benefit, which could help patients understand why some vaccines are recommended at a specific gestational age and in each pregnancy or subsequent pregnancies. 

What is known about pregnant populations that experience disparities in vaccination coverage? 

While vaccination coverage among pregnant people is suboptimal, coverage estimates are often lowest among Black pregnant people, some of whom report experiencing mistreatment and discrimination during pregnancy and delivery.⁷ It is important to recognize that there are many intersecting factors that may impact vaccination coverage. Systemic and structural factors may prohibit some patient populations from accessing vaccinations (eg, transportation barriers, difficulty accessing adequate healthcare for those on government assistance, language barriers). To be responsive to the intersectional lived realities of each of these communities, the medical and public health community continually strives to increase trustworthiness, which can lead to increased uptake of vaccinations in these populations. 

What vaccines are available and recommended for pregnant people?

Four vaccines are routinely recommended during pregnancy: Tdap, COVID-19, influenza (seasonal), and RSV (seasonal). CDC recommends getting a Tdap vaccine between the 27th and 36th week of each pregnancy, preferably during the earlier part of this time period. CDC recommends that everyone 6 months or older in the United States, including pregnant people, stay up to date on COVID-19 vaccines. A COVID-19 vaccine can be given during any trimester of pregnancy. CDC recommends an annual flu vaccine during each flu season (fall/winter) for everyone 6 months or older in the United States, including pregnant people. A flu vaccine can be given during any trimester of pregnancy. For individuals who will be between 32 and 36 weeks pregnant during September through January, CDC recommends getting an RSV vaccine. RSV season and timing of vaccination may vary depending on geography. If a pregnant patient does not get the RSV vaccine during their pregnancy, CDC recommends that their baby receive an RSV monoclonal antibody (nirsevimab) to provide additional protection during the infant’s first RSV season, if they are younger than 8 months. At this time, pregnant people who received an RSV vaccine during a previous pregnancy (last year) are not recommended to receive another RSV vaccine during pregnancy. The current recommendation is for babies born during subsequent pregnancies to receive nirsevimab. Some pregnant people may also need other vaccines, such as hepatitis B. 

How can practitioners approach conversations about vaccination during pregnancy amid increasing vaccine hesitancy?

Many pregnant people who do get vaccinated describe their provider’s recommendation as an important motivator toward vaccination.^8-11 Communications research suggests that practitioners can further increase trustworthiness by openly discussing potential side effects of prenatal vaccinations and providing patients with a rationale for why each vaccine is recommended. Practitioners can also utilize opportunities to communicate that the risk for severe illness from whooping cough, COVID-19, flu, and RSV in pregnancy and among neonates in the first few months of life is often higher than the risk for an adverse reaction from receiving ACIP-recommended vaccines. Finally, practitioners can consider sharing tested and refined patient education resources at least one appointment prior to the recommended administration of each vaccine, providing individuals with time to process the information they need to facilitate their vaccine decision-making process.

Some patients may be more comfortable with older, well-known prenatal vaccinations but have skepticism about newer vaccines like COVID-19 and RSV. How can practitioners respond to these concerns?

As pregnant people navigate the challenges of making health decisions that could impact their developing baby, practitioners can build trust through empathetically responding to safety concerns and questions, particularly with respect to newly authorized vaccines. Vaccine confidence may be strengthened by communicating to patients that all recommended vaccinations, including those that have been newly authorized, have been rigorously tested prior to being recommended for pregnant people. Additionally, in my clinical practice, I see that patients are often more comfortable accepting vaccines when the benefit for the baby is clearly communicated. I have been pleasantly surprised that most patients I have counseled on the new maternal RSV vaccine have been receptive, making statements like, “If this will help protect my baby from getting sick, then yes, I will get it.”

As you and your staff care for pregnant patients during fall and winter virus season, remember that a provider recommendation remains one of the strongest known predictors of vaccination uptake.¹² As a trusted source of information about prenatal vaccination, consider further incorporating patient education resources to help communicate how prenatal vaccination helps pregnant people share important protection against severe illnesses with their babies. 

Haben Debessai, MD, is a Gilstrap Fellow at the CDC Foundation. Debessai also serves as an Emory Obstetrics/Gynecology Adjunct Instructor at Grady Health System in Atlanta, Georgia. She disclosed no relevant conflicts of interest.

References

1. ACOG Committee Opinion No. 741: Maternal Immunization. Obstet Gynecol. 2018;131:e214-e217. doi:10.1097/AOG.0000000000002662

2. Centers for Disease Control and Prevention. Flu, Tdap, and COVID-19 vaccination coverage among pregnant women – United States, April 2024. 2024 Sep 23. 3. Centers for Disease Control and Prevention. Respiratory syncytial virus (rsv) vaccination coverage, pregnant persons. 2024 Nov 19. 4. Centers for Disease Control and Prevention. COVID-19 vaccination coverage, pregnant persons. 2024 Nov 19. 5. Centers for Disease Control and Prevention. Influenza vaccination coverage, pregnant persons. 2024 Nov 19.6. Razzaghi H et al. IMMWR Morb Mortal Wkly Rep. 2023;72:1065-1071. Published 2023 Sep 29. doi: 10.15585/mmwr.mm7239a4

7. Mohamoud YA et al. MMWR Morb Mortal Wkly Rep 2023;72:961-967. doi: https://dx.doi.org/10.15585/mmwr.mm7235e1.

8. Kiefer MK et al. Am J Obstet Gynecol MFM. 2022;4:100603. doi: 10.1016/j.ajogmf.2022.100603

9. Spires B et al. Obstet Gynecol Clin North Am. 2023;50:401-419. doi: 10.1016/j.ogc.2023.02.013

10. Wales DP et al. Public Health. 2020;179:38-44. doi: 10.1016/j.puhe.2019.10.001

11. Zimmerman M et al. J Natl Med Assoc. 2023;115:362-376. doi:10.1016/j.jnma.2023.04.003

12. Castillo E et al. Best Pract Res Clin Obstet Gynaecol. 2021;76:83-95. doi:10.1016/j.bpobgyn.2021.03.008

Vaccines recommended by the Advisory Committee on Immunization Practices (ACIP) offer important protection against severe illness for pregnant people and their babies.¹ However, vaccination coverage estimates among pregnant people remain suboptimal.^2-5 Additionally, some measures indicate that vaccine hesitancy among pregnant people is increasing; for example, 17.5% of surveyed pregnant women reported being very hesitant about influenza vaccination during pregnancy in 2019-2020, compared with 24.7% in 2022-2023.⁶As fall and winter virus season continues, consider opportunities for you and your staff to help communicate the importance of prenatal vaccination to pregnant patients in your care. Explore updated provider toolkits and prenatal vaccination patient education resources, including fact sheets, social media assets, posters, and short videos on respiratory syncytial virus (RSV), Tdap, COVID-19, influenza, and hepatitis B.

In an interview, CDC’s Haben Debessai, MD, an adjunct instructor in obstetrics and gynecology at Emory School of Medicine, Atlanta, Georgia, contextualizes the data to help healthcare professionals communicate effectively with their pregnant patients. 

 

What can practitioners communicate to patients about why it is important to get vaccinated during their pregnancy?

When communicating with their patients, practitioners can consider opportunities to discuss how vaccines work during pregnancy, emphasizing that prenatal vaccinations are beneficial for both the pregnant person and the fetus. It can be helpful to educate patients on how a pregnant person’s immune system can develop antibodies that will then pass to the fetus during the pregnancy and confer protection during the infant’s early months of life — when they are highly susceptible to illnesses that can be severe, such as RSV-associated lower respiratory tract infections. It can also be useful to discuss pregnancy’s impact on the immune system, which contributes to pregnant people being at higher risk for severe illness from infections like COVID-19 and flu, if contracted. The outcomes of severe illness can be dire for both the pregnant person and their pregnancy, which is why vaccination is the best mitigation option. It can also be beneficial to share with patients that some vaccines, like RSV and Tdap, are specifically for neonatal benefit, which could help patients understand why some vaccines are recommended at a specific gestational age and in each pregnancy or subsequent pregnancies. 

What is known about pregnant populations that experience disparities in vaccination coverage? 

While vaccination coverage among pregnant people is suboptimal, coverage estimates are often lowest among Black pregnant people, some of whom report experiencing mistreatment and discrimination during pregnancy and delivery.⁷ It is important to recognize that there are many intersecting factors that may impact vaccination coverage. Systemic and structural factors may prohibit some patient populations from accessing vaccinations (eg, transportation barriers, difficulty accessing adequate healthcare for those on government assistance, language barriers). To be responsive to the intersectional lived realities of each of these communities, the medical and public health community continually strives to increase trustworthiness, which can lead to increased uptake of vaccinations in these populations. 

What vaccines are available and recommended for pregnant people?

Four vaccines are routinely recommended during pregnancy: Tdap, COVID-19, influenza (seasonal), and RSV (seasonal). CDC recommends getting a Tdap vaccine between the 27th and 36th week of each pregnancy, preferably during the earlier part of this time period. CDC recommends that everyone 6 months or older in the United States, including pregnant people, stay up to date on COVID-19 vaccines. A COVID-19 vaccine can be given during any trimester of pregnancy. CDC recommends an annual flu vaccine during each flu season (fall/winter) for everyone 6 months or older in the United States, including pregnant people. A flu vaccine can be given during any trimester of pregnancy. For individuals who will be between 32 and 36 weeks pregnant during September through January, CDC recommends getting an RSV vaccine. RSV season and timing of vaccination may vary depending on geography. If a pregnant patient does not get the RSV vaccine during their pregnancy, CDC recommends that their baby receive an RSV monoclonal antibody (nirsevimab) to provide additional protection during the infant’s first RSV season, if they are younger than 8 months. At this time, pregnant people who received an RSV vaccine during a previous pregnancy (last year) are not recommended to receive another RSV vaccine during pregnancy. The current recommendation is for babies born during subsequent pregnancies to receive nirsevimab. Some pregnant people may also need other vaccines, such as hepatitis B. 

How can practitioners approach conversations about vaccination during pregnancy amid increasing vaccine hesitancy?

Many pregnant people who do get vaccinated describe their provider’s recommendation as an important motivator toward vaccination.^8-11 Communications research suggests that practitioners can further increase trustworthiness by openly discussing potential side effects of prenatal vaccinations and providing patients with a rationale for why each vaccine is recommended. Practitioners can also utilize opportunities to communicate that the risk for severe illness from whooping cough, COVID-19, flu, and RSV in pregnancy and among neonates in the first few months of life is often higher than the risk for an adverse reaction from receiving ACIP-recommended vaccines. Finally, practitioners can consider sharing tested and refined patient education resources at least one appointment prior to the recommended administration of each vaccine, providing individuals with time to process the information they need to facilitate their vaccine decision-making process.

Some patients may be more comfortable with older, well-known prenatal vaccinations but have skepticism about newer vaccines like COVID-19 and RSV. How can practitioners respond to these concerns?

As pregnant people navigate the challenges of making health decisions that could impact their developing baby, practitioners can build trust through empathetically responding to safety concerns and questions, particularly with respect to newly authorized vaccines. Vaccine confidence may be strengthened by communicating to patients that all recommended vaccinations, including those that have been newly authorized, have been rigorously tested prior to being recommended for pregnant people. Additionally, in my clinical practice, I see that patients are often more comfortable accepting vaccines when the benefit for the baby is clearly communicated. I have been pleasantly surprised that most patients I have counseled on the new maternal RSV vaccine have been receptive, making statements like, “If this will help protect my baby from getting sick, then yes, I will get it.”

As you and your staff care for pregnant patients during fall and winter virus season, remember that a provider recommendation remains one of the strongest known predictors of vaccination uptake.¹² As a trusted source of information about prenatal vaccination, consider further incorporating patient education resources to help communicate how prenatal vaccination helps pregnant people share important protection against severe illnesses with their babies. 

Haben Debessai, MD, is a Gilstrap Fellow at the CDC Foundation. Debessai also serves as an Emory Obstetrics/Gynecology Adjunct Instructor at Grady Health System in Atlanta, Georgia. She disclosed no relevant conflicts of interest.

References

1. ACOG Committee Opinion No. 741: Maternal Immunization. Obstet Gynecol. 2018;131:e214-e217. doi:10.1097/AOG.0000000000002662

2. Centers for Disease Control and Prevention. Flu, Tdap, and COVID-19 vaccination coverage among pregnant women – United States, April 2024. 2024 Sep 23. 3. Centers for Disease Control and Prevention. Respiratory syncytial virus (rsv) vaccination coverage, pregnant persons. 2024 Nov 19. 4. Centers for Disease Control and Prevention. COVID-19 vaccination coverage, pregnant persons. 2024 Nov 19. 5. Centers for Disease Control and Prevention. Influenza vaccination coverage, pregnant persons. 2024 Nov 19.6. Razzaghi H et al. IMMWR Morb Mortal Wkly Rep. 2023;72:1065-1071. Published 2023 Sep 29. doi: 10.15585/mmwr.mm7239a4

7. Mohamoud YA et al. MMWR Morb Mortal Wkly Rep 2023;72:961-967. doi: https://dx.doi.org/10.15585/mmwr.mm7235e1.

8. Kiefer MK et al. Am J Obstet Gynecol MFM. 2022;4:100603. doi: 10.1016/j.ajogmf.2022.100603

9. Spires B et al. Obstet Gynecol Clin North Am. 2023;50:401-419. doi: 10.1016/j.ogc.2023.02.013

10. Wales DP et al. Public Health. 2020;179:38-44. doi: 10.1016/j.puhe.2019.10.001

11. Zimmerman M et al. J Natl Med Assoc. 2023;115:362-376. doi:10.1016/j.jnma.2023.04.003

12. Castillo E et al. Best Pract Res Clin Obstet Gynaecol. 2021;76:83-95. doi:10.1016/j.bpobgyn.2021.03.008

Vaccines recommended by the Advisory Committee on Immunization Practices (ACIP) offer important protection against severe illness for pregnant people and their babies.¹ However, vaccination coverage estimates among pregnant people remain suboptimal.^2-5 Additionally, some measures indicate that vaccine hesitancy among pregnant people is increasing; for example, 17.5% of surveyed pregnant women reported being very hesitant about influenza vaccination during pregnancy in 2019-2020, compared with 24.7% in 2022-2023.⁶As fall and winter virus season continues, consider opportunities for you and your staff to help communicate the importance of prenatal vaccination to pregnant patients in your care. Explore updated provider toolkits and prenatal vaccination patient education resources, including fact sheets, social media assets, posters, and short videos on respiratory syncytial virus (RSV), Tdap, COVID-19, influenza, and hepatitis B.

In an interview, CDC’s Haben Debessai, MD, an adjunct instructor in obstetrics and gynecology at Emory School of Medicine, Atlanta, Georgia, contextualizes the data to help healthcare professionals communicate effectively with their pregnant patients. 

 

What can practitioners communicate to patients about why it is important to get vaccinated during their pregnancy?

When communicating with their patients, practitioners can consider opportunities to discuss how vaccines work during pregnancy, emphasizing that prenatal vaccinations are beneficial for both the pregnant person and the fetus. It can be helpful to educate patients on how a pregnant person’s immune system can develop antibodies that will then pass to the fetus during the pregnancy and confer protection during the infant’s early months of life — when they are highly susceptible to illnesses that can be severe, such as RSV-associated lower respiratory tract infections. It can also be useful to discuss pregnancy’s impact on the immune system, which contributes to pregnant people being at higher risk for severe illness from infections like COVID-19 and flu, if contracted. The outcomes of severe illness can be dire for both the pregnant person and their pregnancy, which is why vaccination is the best mitigation option. It can also be beneficial to share with patients that some vaccines, like RSV and Tdap, are specifically for neonatal benefit, which could help patients understand why some vaccines are recommended at a specific gestational age and in each pregnancy or subsequent pregnancies. 

What is known about pregnant populations that experience disparities in vaccination coverage? 

While vaccination coverage among pregnant people is suboptimal, coverage estimates are often lowest among Black pregnant people, some of whom report experiencing mistreatment and discrimination during pregnancy and delivery.⁷ It is important to recognize that there are many intersecting factors that may impact vaccination coverage. Systemic and structural factors may prohibit some patient populations from accessing vaccinations (eg, transportation barriers, difficulty accessing adequate healthcare for those on government assistance, language barriers). To be responsive to the intersectional lived realities of each of these communities, the medical and public health community continually strives to increase trustworthiness, which can lead to increased uptake of vaccinations in these populations. 

What vaccines are available and recommended for pregnant people?

Four vaccines are routinely recommended during pregnancy: Tdap, COVID-19, influenza (seasonal), and RSV (seasonal). CDC recommends getting a Tdap vaccine between the 27th and 36th week of each pregnancy, preferably during the earlier part of this time period. CDC recommends that everyone 6 months or older in the United States, including pregnant people, stay up to date on COVID-19 vaccines. A COVID-19 vaccine can be given during any trimester of pregnancy. CDC recommends an annual flu vaccine during each flu season (fall/winter) for everyone 6 months or older in the United States, including pregnant people. A flu vaccine can be given during any trimester of pregnancy. For individuals who will be between 32 and 36 weeks pregnant during September through January, CDC recommends getting an RSV vaccine. RSV season and timing of vaccination may vary depending on geography. If a pregnant patient does not get the RSV vaccine during their pregnancy, CDC recommends that their baby receive an RSV monoclonal antibody (nirsevimab) to provide additional protection during the infant’s first RSV season, if they are younger than 8 months. At this time, pregnant people who received an RSV vaccine during a previous pregnancy (last year) are not recommended to receive another RSV vaccine during pregnancy. The current recommendation is for babies born during subsequent pregnancies to receive nirsevimab. Some pregnant people may also need other vaccines, such as hepatitis B. 

How can practitioners approach conversations about vaccination during pregnancy amid increasing vaccine hesitancy?

Many pregnant people who do get vaccinated describe their provider’s recommendation as an important motivator toward vaccination.^8-11 Communications research suggests that practitioners can further increase trustworthiness by openly discussing potential side effects of prenatal vaccinations and providing patients with a rationale for why each vaccine is recommended. Practitioners can also utilize opportunities to communicate that the risk for severe illness from whooping cough, COVID-19, flu, and RSV in pregnancy and among neonates in the first few months of life is often higher than the risk for an adverse reaction from receiving ACIP-recommended vaccines. Finally, practitioners can consider sharing tested and refined patient education resources at least one appointment prior to the recommended administration of each vaccine, providing individuals with time to process the information they need to facilitate their vaccine decision-making process.

Some patients may be more comfortable with older, well-known prenatal vaccinations but have skepticism about newer vaccines like COVID-19 and RSV. How can practitioners respond to these concerns?

As pregnant people navigate the challenges of making health decisions that could impact their developing baby, practitioners can build trust through empathetically responding to safety concerns and questions, particularly with respect to newly authorized vaccines. Vaccine confidence may be strengthened by communicating to patients that all recommended vaccinations, including those that have been newly authorized, have been rigorously tested prior to being recommended for pregnant people. Additionally, in my clinical practice, I see that patients are often more comfortable accepting vaccines when the benefit for the baby is clearly communicated. I have been pleasantly surprised that most patients I have counseled on the new maternal RSV vaccine have been receptive, making statements like, “If this will help protect my baby from getting sick, then yes, I will get it.”

As you and your staff care for pregnant patients during fall and winter virus season, remember that a provider recommendation remains one of the strongest known predictors of vaccination uptake.¹² As a trusted source of information about prenatal vaccination, consider further incorporating patient education resources to help communicate how prenatal vaccination helps pregnant people share important protection against severe illnesses with their babies. 

Haben Debessai, MD, is a Gilstrap Fellow at the CDC Foundation. Debessai also serves as an Emory Obstetrics/Gynecology Adjunct Instructor at Grady Health System in Atlanta, Georgia. She disclosed no relevant conflicts of interest.

References

1. ACOG Committee Opinion No. 741: Maternal Immunization. Obstet Gynecol. 2018;131:e214-e217. doi:10.1097/AOG.0000000000002662

2. Centers for Disease Control and Prevention. Flu, Tdap, and COVID-19 vaccination coverage among pregnant women – United States, April 2024. 2024 Sep 23. 3. Centers for Disease Control and Prevention. Respiratory syncytial virus (rsv) vaccination coverage, pregnant persons. 2024 Nov 19. 4. Centers for Disease Control and Prevention. COVID-19 vaccination coverage, pregnant persons. 2024 Nov 19. 5. Centers for Disease Control and Prevention. Influenza vaccination coverage, pregnant persons. 2024 Nov 19.6. Razzaghi H et al. IMMWR Morb Mortal Wkly Rep. 2023;72:1065-1071. Published 2023 Sep 29. doi: 10.15585/mmwr.mm7239a4

7. Mohamoud YA et al. MMWR Morb Mortal Wkly Rep 2023;72:961-967. doi: https://dx.doi.org/10.15585/mmwr.mm7235e1.

8. Kiefer MK et al. Am J Obstet Gynecol MFM. 2022;4:100603. doi: 10.1016/j.ajogmf.2022.100603

9. Spires B et al. Obstet Gynecol Clin North Am. 2023;50:401-419. doi: 10.1016/j.ogc.2023.02.013

10. Wales DP et al. Public Health. 2020;179:38-44. doi: 10.1016/j.puhe.2019.10.001

11. Zimmerman M et al. J Natl Med Assoc. 2023;115:362-376. doi:10.1016/j.jnma.2023.04.003

12. Castillo E et al. Best Pract Res Clin Obstet Gynaecol. 2021;76:83-95. doi:10.1016/j.bpobgyn.2021.03.008

The updated COVID vaccines for 2024-2025 are officially here, designed to target the latest variants and offer robust protection — but getting Americans to roll up their sleeves could prove harder than ever. With COVID cases on the decline, many people feel the urgency has passed.

As of December 2, the CDC reports that COVID test positivity remains low, rising slightly to 4.5% for the week ending November 23, compared with 4.2% the previous week. That’s a far cry from the early days of 2022, when positivity rates soared above 30%. Emergency room visits for COVID now make up just 0.5%, and deaths are down to 0.8% of total weekly fatalities, compared to 1% the previous week.

This steady improvement in the numbers may explain why a recent Pew Research Center survey revealed that 6 in 10 US adults have no plans to get the updated vaccine this year.

As of December 2, according to the CDC, just 19.7% of the US adult population and 9.4% of children had gotten the updated vaccine. The age group most likely? Adults ages 65 and older, with 41.6% getting the updated shot.

Despite the good news about declining cases, our pandemic history suggests a pre-holiday increase is likely. On November 20, the CDC warned it expects levels of both COVID and RSV (respiratory syncytial virus) to rise in the coming weeks — the familiar post-Thanksgiving, pre-Christmas, and Hanukkah increase.

Here’s what to know about the 2024-2025 vaccines — what’s available, how the updated versions are tested, how well each protects you, side effects and other safety information, the best time to get them, and where.



 

What’s Available?

Three updated vaccines, which work two different ways, are authorized or licensed by the FDA for the 2024-2025 season:

Novavax. A protein subunit vaccine, Novavax is authorized for emergency use by the FDA in people ages 12 and older. The vaccine makes a protein that mimics the SARS-CoV-2 virus’ version of the spike protein and combines it with an adjuvant or “booster” to stimulate a protective immune response. This year’s version targets the JN.1 variant.

Pfizer/BioNTech. Its Comirnaty is a fully licensed vaccine for people ages 12 and older. Its mechanism of action is by messenger RNA (mRNA). It works by instructing cells to produce viral proteins, triggering an immune response. Pfizer’s COVID vaccine is authorized for emergency use in children ages 6 months to 11 years. This year’s version targets KP.2.

Moderna. Its Spikevax is a fully licensed vaccine for people ages 12 and older. It is also an mRNA vaccine. Moderna’s COVID-19 vaccine is authorized for emergency use in children ages 6 months to 11 years. This year’s version targets KP.2.

 

How Effective Are They?

Before being approved for this year’s use, each company had to show its updated vaccine is effective against the currently circulating variants. For the 2 weeks ending November 23, KP.3.1.1 and XEC, from the Omicron lineage, made up the majority of cases, according to CDC data.

How do the vaccine makers know their updated vaccines are targeting the circulating variants? The companies use “pre-clinical” data, which means the updated versions have not yet been tested in people but in other ways, such as animal studies. But they do have to prove to the FDA that their updated vaccine can neutralize the circulating variants.

Companies continue to monitor their updated vaccines as new variants appear. Later in the season, there will be more specific information about how well each vaccine protects in people after tracking real-world data.

 

What About Side Effects?

The CDC lists comparable side effects for both mRNA and protein COVID vaccines, including pain and soreness from the needle, fatigue, headache, muscle pain joint pain, chills, fever, nausea, and vomiting.

Severe allergic reactions are rare, the CDC says, but cautions to be alert for low blood pressure, swelling of the lips, tongue, or throat, or difficulty breathing.

 

Which One Is Best?

“I consider the three currently available COVID vaccines — Pfizer, Moderna, and Novavax — interchangeable,’’ said Scott Roberts, MD, an infectious diseases specialist and assistant professor of medicine at Yale School of Medicine in New Haven, Connecticut. “There have not been head-to-head studies, and the initial vaccine studies for each were performed at different phases of the pandemic, so we do not have great data to guide which one is better than another.”

He does point out the different mechanisms of action, which may make a difference in people’s choice of vaccines. “So if someone has a reaction to one of them, they can switch to a different brand.”

 

Best Time to Get It?

“We have consistently seen COVID rates rise quite significantly in the winter season, especially around the holidays. So if anyone is on the fence and hasn’t gotten the updated vaccine yet, now is a great time to get it to maximize immunity for the holidays,” he said.

What’s next? In late October, the CDC recommended a second dose of the 2024-2025 vaccine 6 months after the first one for those age 65 and above and those 6 months old and older who are moderately or severely immunocompromised.

Now, while it’s tempting to think rates are down and will continue to drop steadily, Roberts reminds people that pandemic history suggests otherwise.

 

Coverage

Most people can get COVID-19 vaccines at no cost through their private health insurance, Medicaid, or Medicare. For the uninsured, there’s also the Vaccines for Children (VFC) program or access through state and local health departments and some health centers. Find details on the CDC website.

A version of this article first appeared on WebMD.

The updated COVID vaccines for 2024-2025 are officially here, designed to target the latest variants and offer robust protection — but getting Americans to roll up their sleeves could prove harder than ever. With COVID cases on the decline, many people feel the urgency has passed.

As of December 2, the CDC reports that COVID test positivity remains low, rising slightly to 4.5% for the week ending November 23, compared with 4.2% the previous week. That’s a far cry from the early days of 2022, when positivity rates soared above 30%. Emergency room visits for COVID now make up just 0.5%, and deaths are down to 0.8% of total weekly fatalities, compared to 1% the previous week.

This steady improvement in the numbers may explain why a recent Pew Research Center survey revealed that 6 in 10 US adults have no plans to get the updated vaccine this year.

As of December 2, according to the CDC, just 19.7% of the US adult population and 9.4% of children had gotten the updated vaccine. The age group most likely? Adults ages 65 and older, with 41.6% getting the updated shot.

Despite the good news about declining cases, our pandemic history suggests a pre-holiday increase is likely. On November 20, the CDC warned it expects levels of both COVID and RSV (respiratory syncytial virus) to rise in the coming weeks — the familiar post-Thanksgiving, pre-Christmas, and Hanukkah increase.

Here’s what to know about the 2024-2025 vaccines — what’s available, how the updated versions are tested, how well each protects you, side effects and other safety information, the best time to get them, and where.



 

What’s Available?

Three updated vaccines, which work two different ways, are authorized or licensed by the FDA for the 2024-2025 season:

Novavax. A protein subunit vaccine, Novavax is authorized for emergency use by the FDA in people ages 12 and older. The vaccine makes a protein that mimics the SARS-CoV-2 virus’ version of the spike protein and combines it with an adjuvant or “booster” to stimulate a protective immune response. This year’s version targets the JN.1 variant.

Pfizer/BioNTech. Its Comirnaty is a fully licensed vaccine for people ages 12 and older. Its mechanism of action is by messenger RNA (mRNA). It works by instructing cells to produce viral proteins, triggering an immune response. Pfizer’s COVID vaccine is authorized for emergency use in children ages 6 months to 11 years. This year’s version targets KP.2.

Moderna. Its Spikevax is a fully licensed vaccine for people ages 12 and older. It is also an mRNA vaccine. Moderna’s COVID-19 vaccine is authorized for emergency use in children ages 6 months to 11 years. This year’s version targets KP.2.

 

How Effective Are They?

Before being approved for this year’s use, each company had to show its updated vaccine is effective against the currently circulating variants. For the 2 weeks ending November 23, KP.3.1.1 and XEC, from the Omicron lineage, made up the majority of cases, according to CDC data.

How do the vaccine makers know their updated vaccines are targeting the circulating variants? The companies use “pre-clinical” data, which means the updated versions have not yet been tested in people but in other ways, such as animal studies. But they do have to prove to the FDA that their updated vaccine can neutralize the circulating variants.

Companies continue to monitor their updated vaccines as new variants appear. Later in the season, there will be more specific information about how well each vaccine protects in people after tracking real-world data.

 

What About Side Effects?

The CDC lists comparable side effects for both mRNA and protein COVID vaccines, including pain and soreness from the needle, fatigue, headache, muscle pain joint pain, chills, fever, nausea, and vomiting.

Severe allergic reactions are rare, the CDC says, but cautions to be alert for low blood pressure, swelling of the lips, tongue, or throat, or difficulty breathing.

 

Which One Is Best?

“I consider the three currently available COVID vaccines — Pfizer, Moderna, and Novavax — interchangeable,’’ said Scott Roberts, MD, an infectious diseases specialist and assistant professor of medicine at Yale School of Medicine in New Haven, Connecticut. “There have not been head-to-head studies, and the initial vaccine studies for each were performed at different phases of the pandemic, so we do not have great data to guide which one is better than another.”

He does point out the different mechanisms of action, which may make a difference in people’s choice of vaccines. “So if someone has a reaction to one of them, they can switch to a different brand.”

 

Best Time to Get It?

“We have consistently seen COVID rates rise quite significantly in the winter season, especially around the holidays. So if anyone is on the fence and hasn’t gotten the updated vaccine yet, now is a great time to get it to maximize immunity for the holidays,” he said.

What’s next? In late October, the CDC recommended a second dose of the 2024-2025 vaccine 6 months after the first one for those age 65 and above and those 6 months old and older who are moderately or severely immunocompromised.

Now, while it’s tempting to think rates are down and will continue to drop steadily, Roberts reminds people that pandemic history suggests otherwise.

 

Coverage

Most people can get COVID-19 vaccines at no cost through their private health insurance, Medicaid, or Medicare. For the uninsured, there’s also the Vaccines for Children (VFC) program or access through state and local health departments and some health centers. Find details on the CDC website.

A version of this article first appeared on WebMD.

The updated COVID vaccines for 2024-2025 are officially here, designed to target the latest variants and offer robust protection — but getting Americans to roll up their sleeves could prove harder than ever. With COVID cases on the decline, many people feel the urgency has passed.

As of December 2, the CDC reports that COVID test positivity remains low, rising slightly to 4.5% for the week ending November 23, compared with 4.2% the previous week. That’s a far cry from the early days of 2022, when positivity rates soared above 30%. Emergency room visits for COVID now make up just 0.5%, and deaths are down to 0.8% of total weekly fatalities, compared to 1% the previous week.

This steady improvement in the numbers may explain why a recent Pew Research Center survey revealed that 6 in 10 US adults have no plans to get the updated vaccine this year.

As of December 2, according to the CDC, just 19.7% of the US adult population and 9.4% of children had gotten the updated vaccine. The age group most likely? Adults ages 65 and older, with 41.6% getting the updated shot.

Despite the good news about declining cases, our pandemic history suggests a pre-holiday increase is likely. On November 20, the CDC warned it expects levels of both COVID and RSV (respiratory syncytial virus) to rise in the coming weeks — the familiar post-Thanksgiving, pre-Christmas, and Hanukkah increase.

Here’s what to know about the 2024-2025 vaccines — what’s available, how the updated versions are tested, how well each protects you, side effects and other safety information, the best time to get them, and where.



 

What’s Available?

Three updated vaccines, which work two different ways, are authorized or licensed by the FDA for the 2024-2025 season:

Novavax. A protein subunit vaccine, Novavax is authorized for emergency use by the FDA in people ages 12 and older. The vaccine makes a protein that mimics the SARS-CoV-2 virus’ version of the spike protein and combines it with an adjuvant or “booster” to stimulate a protective immune response. This year’s version targets the JN.1 variant.

Pfizer/BioNTech. Its Comirnaty is a fully licensed vaccine for people ages 12 and older. Its mechanism of action is by messenger RNA (mRNA). It works by instructing cells to produce viral proteins, triggering an immune response. Pfizer’s COVID vaccine is authorized for emergency use in children ages 6 months to 11 years. This year’s version targets KP.2.

Moderna. Its Spikevax is a fully licensed vaccine for people ages 12 and older. It is also an mRNA vaccine. Moderna’s COVID-19 vaccine is authorized for emergency use in children ages 6 months to 11 years. This year’s version targets KP.2.

 

How Effective Are They?

Before being approved for this year’s use, each company had to show its updated vaccine is effective against the currently circulating variants. For the 2 weeks ending November 23, KP.3.1.1 and XEC, from the Omicron lineage, made up the majority of cases, according to CDC data.

How do the vaccine makers know their updated vaccines are targeting the circulating variants? The companies use “pre-clinical” data, which means the updated versions have not yet been tested in people but in other ways, such as animal studies. But they do have to prove to the FDA that their updated vaccine can neutralize the circulating variants.

Companies continue to monitor their updated vaccines as new variants appear. Later in the season, there will be more specific information about how well each vaccine protects in people after tracking real-world data.

 

What About Side Effects?

The CDC lists comparable side effects for both mRNA and protein COVID vaccines, including pain and soreness from the needle, fatigue, headache, muscle pain joint pain, chills, fever, nausea, and vomiting.

Severe allergic reactions are rare, the CDC says, but cautions to be alert for low blood pressure, swelling of the lips, tongue, or throat, or difficulty breathing.

 

Which One Is Best?

“I consider the three currently available COVID vaccines — Pfizer, Moderna, and Novavax — interchangeable,’’ said Scott Roberts, MD, an infectious diseases specialist and assistant professor of medicine at Yale School of Medicine in New Haven, Connecticut. “There have not been head-to-head studies, and the initial vaccine studies for each were performed at different phases of the pandemic, so we do not have great data to guide which one is better than another.”

He does point out the different mechanisms of action, which may make a difference in people’s choice of vaccines. “So if someone has a reaction to one of them, they can switch to a different brand.”

 

Best Time to Get It?

“We have consistently seen COVID rates rise quite significantly in the winter season, especially around the holidays. So if anyone is on the fence and hasn’t gotten the updated vaccine yet, now is a great time to get it to maximize immunity for the holidays,” he said.

What’s next? In late October, the CDC recommended a second dose of the 2024-2025 vaccine 6 months after the first one for those age 65 and above and those 6 months old and older who are moderately or severely immunocompromised.

Now, while it’s tempting to think rates are down and will continue to drop steadily, Roberts reminds people that pandemic history suggests otherwise.

 

Coverage

Most people can get COVID-19 vaccines at no cost through their private health insurance, Medicaid, or Medicare. For the uninsured, there’s also the Vaccines for Children (VFC) program or access through state and local health departments and some health centers. Find details on the CDC website.

A version of this article first appeared on WebMD.

Vaccines for treating and preventing cancer have long been considered a holy grail in oncology.

But aside from a few notable exceptions — including the human papillomavirus (HPV) vaccine, which has dramatically reduced the incidence of HPV-related cancers, and a Bacillus Calmette-Guerin vaccine, which helps prevent early-stage bladder cancer recurrence — most have failed to deliver.

Following a string of disappointments over the past decade, recent advances in the immunotherapy space are bringing renewed hope for progress.

In an American Association for Cancer Research (AACR) series earlier in 2024, Catherine J. Wu, MD, predicted big strides for cancer vaccines, especially for personalized vaccines that target patient-specific neoantigens — the proteins that form on cancer cells — as well as vaccines that can treat diverse tumor types.

“A focus on neoantigens that arise from driver mutations in different tumor types could allow us to make progress in creating off-the-shelf vaccines,” said Wu, the Lavine Family Chair of Preventative Cancer Therapies at Dana-Farber Cancer Institute and a professor of medicine at Harvard Medical School, both in Boston, Massachusetts.

A prime example is a personalized, messenger RNA (mRNA)–based vaccine designed to prevent melanoma recurrence. The mRNA-4157 vaccine encodes up to 34 different patient-specific neoantigens.

“This is one of the most exciting developments in modern cancer therapy,” said Lawrence Young, a virologist and professor of molecular oncology at the University of Warwick, Coventry, England, who commented on the investigational vaccine via the UK-based Science Media Centre.

Other promising options are on the horizon as well. In August, BioNTech announced a phase 1 global trial to study BNT116 — a vaccine to treat non–small cell lung cancer (NSCLC). BNT116, like mRNA-4157, targets specific antigens in the lung cancer cells.

“This technology is the next big phase of cancer treatment,” Siow Ming Lee, MD, a consultant medical oncologist at University College London Hospitals in England, which is leading the UK trial for the lung cancer and melanoma vaccines, told The Guardian. “We are now entering this very exciting new era of mRNA-based immunotherapy clinical trials to investigate the treatment of lung cancer.”

Still, these predictions have a familiar ring. While the prospects are exciting, delivering on them is another story. There are simply no guarantees these strategies will work as hoped.

 

Then: Where We Were

Cancer vaccine research began to ramp up in the 2000s, and in 2006, the first-generation HPV vaccine, Gardasil, was approved. Gardasil prevents infection from four strains of HPV that cause about 80% of cervical cancer cases.

In 2010, the Food and Drug Administration approved sipuleucel-T, the first therapeutic cancer vaccine, which improved overall survival in patients with hormone-refractory prostate cancer.

Researchers predicted this approval would “pave the way for developing innovative, next generation of vaccines with enhanced antitumor potency.”

In a 2015 AACR research forecast report, Drew Pardoll, MD, PhD, co-director of the Cancer Immunology and Hematopoiesis Program at Johns Hopkins University, Baltimore, Maryland, said that “we can expect to see encouraging results from studies using cancer vaccines.”

Despite the excitement surrounding cancer vaccines alongside a few successes, the next decade brought a longer string of late-phase disappointments.

In 2016, the phase 3 ACT IV trial of a therapeutic vaccine to treat glioblastoma multiforme (CDX-110) was terminated after it failed to demonstrate improved survival.

In 2017, a phase 3 trial of the therapeutic pancreatic cancer vaccine, GVAX, was stopped early for lack of efficacy.

That year, an attenuated Listeria monocytogenes vaccine to treat pancreatic cancer and mesothelioma also failed to come to fruition. In late 2017, concerns over listeria infections prompted Aduro Biotech to cancel its listeria-based cancer treatment program.

In 2018, a phase 3 trial of belagenpumatucel-L, a therapeutic NSCLC vaccine, failed to demonstrate a significant improvement in survival and further study was discontinued.

And in 2019, a vaccine targeting MAGE-A3, a cancer-testis antigen present in multiple tumor types, failed to meet endpoints for improved survival in a phase 3 trial, leading to discontinuation of the vaccine program.

But these disappointments and failures are normal parts of medical research and drug development and have allowed for incremental advances that helped fuel renewed interest and hope for cancer vaccines, when the timing was right, explained vaccine pioneer Larry W. Kwak, MD, PhD, deputy director of the Comprehensive Cancer Center at City of Hope, Duarte, California.

When it comes to vaccine progress, timing makes a difference. In 2011, Kwak and colleagues published promising phase 3 trial results on a personalized vaccine. The vaccine was a patient-specific tumor-derived antigen for patients with follicular lymphoma in their first remission following chemotherapy. Patients who received the vaccine demonstrated significantly longer disease-free survival.

But, at the time, personalized vaccines faced strong headwinds due, largely, to high costs, and commercial interest failed to materialize. “That’s been the major hurdle for a long time,” said Kwak.

Now, however, interest has returned alongside advances in technology and research. The big shift has been the emergence of lower-cost rapid-production mRNA and DNA platforms and a better understanding of how vaccines and potent immune stimulants, like checkpoint inhibitors, can work together to improve outcomes, he explained.

“The timing wasn’t right” back then, Kwak noted. “Now, it’s a different environment and a different time.”

 

A Turning Point?

Indeed, a decade later, cancer vaccine development appears to be headed in a more promising direction.

Among key cancer vaccines to watch is the mRNA-4157 vaccine, developed by Merck and Moderna, designed to prevent melanoma recurrence. In a recent phase 2 study, patients receiving the mRNA-4157 vaccine alongside pembrolizumab had nearly half the risk for melanoma recurrence or death at 3 years compared with those receiving pembrolizumab alone. Investigators are now evaluating the vaccine in a global phase 3 study in patients with high-risk, stage IIB to IV melanoma following surgery.

Another one to watch is the BNT116 NSCLC vaccine from BioNTech. This vaccine presents the immune system with NSCLC tumor markers to encourage the body to fight cancer cells expressing those markers while ignoring healthy cells. BioNTech also launched a global clinical trial for its vaccine this year.

Other notables include a pancreatic cancer mRNA vaccine, which has shown promising early results in a small trial of 16 patients. Of 16 patients who received the vaccine alongside chemotherapy and after surgery and immunotherapy, 8 responded. Of these eight, six remained recurrence free at 3 years. Investigators noted that the vaccine appeared to stimulate a durable T-cell response in patients who responded.

Kwak has also continued his work on lymphoma vaccines. In August, his team published promising first-in-human data on the use of personalized neoantigen vaccines as an early intervention in untreated patients with lymphoplasmacytic lymphoma. Among nine asymptomatic patients who received the vaccine, all achieved stable disease or better, with no dose-limiting toxicities. One patient had a minor response, and the median time to progression was greater than 72 months.

“The current setting is more for advanced disease,” Kwak explained. “It’s a tougher task, but combined with checkpoint blockade, it may be potent enough to work.” 

Still, caution is important. Despite early promise, it’s too soon to tell which, if any, of these investigational vaccines will pan out in the long run. Like investigational drugs, cancer vaccines may show big promising initially but then fail in larger trials.

One key to success, according to Kwak, is to design trials so that even negative results will inform next steps.

But, he noted, failures in large clinical trials will “put a chilling effect on cancer vaccine research again.”

“That’s what keeps me up at night,” he said. “We know the science is fundamentally sound and we have seen glimpses over decades of research that cancer vaccines can work, so it’s really just a matter of tweaking things to optimize trial design.”

Companies tend to design trials to test if a vaccine works or not, without trying to understand why, he said.

“What we need to do is design those so that we can learn from negative results,” he said. That’s what he and his colleagues attempted to do in their recent trial. “We didn’t just look at clinical results; we’re interrogating the actual tumor environment to understand what worked and didn’t and how to tweak that for the next trial.”

Kwak and his colleagues found, for instance, that the vaccine had a greater effect on B cell–derived tumor cells than on cells of plasma origin, so “the most rational design for the next iteration is to combine the vaccine with agents that work directly against plasma cells,” he explained.

As for what’s next, Kwak said: “We’re just focused on trying to do good science and understand. We’ve seen glimpses of success. That’s where we are.”

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

Vaccines for treating and preventing cancer have long been considered a holy grail in oncology.

But aside from a few notable exceptions — including the human papillomavirus (HPV) vaccine, which has dramatically reduced the incidence of HPV-related cancers, and a Bacillus Calmette-Guerin vaccine, which helps prevent early-stage bladder cancer recurrence — most have failed to deliver.

Following a string of disappointments over the past decade, recent advances in the immunotherapy space are bringing renewed hope for progress.

In an American Association for Cancer Research (AACR) series earlier in 2024, Catherine J. Wu, MD, predicted big strides for cancer vaccines, especially for personalized vaccines that target patient-specific neoantigens — the proteins that form on cancer cells — as well as vaccines that can treat diverse tumor types.

“A focus on neoantigens that arise from driver mutations in different tumor types could allow us to make progress in creating off-the-shelf vaccines,” said Wu, the Lavine Family Chair of Preventative Cancer Therapies at Dana-Farber Cancer Institute and a professor of medicine at Harvard Medical School, both in Boston, Massachusetts.

A prime example is a personalized, messenger RNA (mRNA)–based vaccine designed to prevent melanoma recurrence. The mRNA-4157 vaccine encodes up to 34 different patient-specific neoantigens.

“This is one of the most exciting developments in modern cancer therapy,” said Lawrence Young, a virologist and professor of molecular oncology at the University of Warwick, Coventry, England, who commented on the investigational vaccine via the UK-based Science Media Centre.

Other promising options are on the horizon as well. In August, BioNTech announced a phase 1 global trial to study BNT116 — a vaccine to treat non–small cell lung cancer (NSCLC). BNT116, like mRNA-4157, targets specific antigens in the lung cancer cells.

“This technology is the next big phase of cancer treatment,” Siow Ming Lee, MD, a consultant medical oncologist at University College London Hospitals in England, which is leading the UK trial for the lung cancer and melanoma vaccines, told The Guardian. “We are now entering this very exciting new era of mRNA-based immunotherapy clinical trials to investigate the treatment of lung cancer.”

Still, these predictions have a familiar ring. While the prospects are exciting, delivering on them is another story. There are simply no guarantees these strategies will work as hoped.

 

Then: Where We Were

Cancer vaccine research began to ramp up in the 2000s, and in 2006, the first-generation HPV vaccine, Gardasil, was approved. Gardasil prevents infection from four strains of HPV that cause about 80% of cervical cancer cases.

In 2010, the Food and Drug Administration approved sipuleucel-T, the first therapeutic cancer vaccine, which improved overall survival in patients with hormone-refractory prostate cancer.

Researchers predicted this approval would “pave the way for developing innovative, next generation of vaccines with enhanced antitumor potency.”

In a 2015 AACR research forecast report, Drew Pardoll, MD, PhD, co-director of the Cancer Immunology and Hematopoiesis Program at Johns Hopkins University, Baltimore, Maryland, said that “we can expect to see encouraging results from studies using cancer vaccines.”

Despite the excitement surrounding cancer vaccines alongside a few successes, the next decade brought a longer string of late-phase disappointments.

In 2016, the phase 3 ACT IV trial of a therapeutic vaccine to treat glioblastoma multiforme (CDX-110) was terminated after it failed to demonstrate improved survival.

In 2017, a phase 3 trial of the therapeutic pancreatic cancer vaccine, GVAX, was stopped early for lack of efficacy.

That year, an attenuated Listeria monocytogenes vaccine to treat pancreatic cancer and mesothelioma also failed to come to fruition. In late 2017, concerns over listeria infections prompted Aduro Biotech to cancel its listeria-based cancer treatment program.

In 2018, a phase 3 trial of belagenpumatucel-L, a therapeutic NSCLC vaccine, failed to demonstrate a significant improvement in survival and further study was discontinued.

And in 2019, a vaccine targeting MAGE-A3, a cancer-testis antigen present in multiple tumor types, failed to meet endpoints for improved survival in a phase 3 trial, leading to discontinuation of the vaccine program.

But these disappointments and failures are normal parts of medical research and drug development and have allowed for incremental advances that helped fuel renewed interest and hope for cancer vaccines, when the timing was right, explained vaccine pioneer Larry W. Kwak, MD, PhD, deputy director of the Comprehensive Cancer Center at City of Hope, Duarte, California.

When it comes to vaccine progress, timing makes a difference. In 2011, Kwak and colleagues published promising phase 3 trial results on a personalized vaccine. The vaccine was a patient-specific tumor-derived antigen for patients with follicular lymphoma in their first remission following chemotherapy. Patients who received the vaccine demonstrated significantly longer disease-free survival.

But, at the time, personalized vaccines faced strong headwinds due, largely, to high costs, and commercial interest failed to materialize. “That’s been the major hurdle for a long time,” said Kwak.

Now, however, interest has returned alongside advances in technology and research. The big shift has been the emergence of lower-cost rapid-production mRNA and DNA platforms and a better understanding of how vaccines and potent immune stimulants, like checkpoint inhibitors, can work together to improve outcomes, he explained.

“The timing wasn’t right” back then, Kwak noted. “Now, it’s a different environment and a different time.”

 

A Turning Point?

Indeed, a decade later, cancer vaccine development appears to be headed in a more promising direction.

Among key cancer vaccines to watch is the mRNA-4157 vaccine, developed by Merck and Moderna, designed to prevent melanoma recurrence. In a recent phase 2 study, patients receiving the mRNA-4157 vaccine alongside pembrolizumab had nearly half the risk for melanoma recurrence or death at 3 years compared with those receiving pembrolizumab alone. Investigators are now evaluating the vaccine in a global phase 3 study in patients with high-risk, stage IIB to IV melanoma following surgery.

Another one to watch is the BNT116 NSCLC vaccine from BioNTech. This vaccine presents the immune system with NSCLC tumor markers to encourage the body to fight cancer cells expressing those markers while ignoring healthy cells. BioNTech also launched a global clinical trial for its vaccine this year.

Other notables include a pancreatic cancer mRNA vaccine, which has shown promising early results in a small trial of 16 patients. Of 16 patients who received the vaccine alongside chemotherapy and after surgery and immunotherapy, 8 responded. Of these eight, six remained recurrence free at 3 years. Investigators noted that the vaccine appeared to stimulate a durable T-cell response in patients who responded.

Kwak has also continued his work on lymphoma vaccines. In August, his team published promising first-in-human data on the use of personalized neoantigen vaccines as an early intervention in untreated patients with lymphoplasmacytic lymphoma. Among nine asymptomatic patients who received the vaccine, all achieved stable disease or better, with no dose-limiting toxicities. One patient had a minor response, and the median time to progression was greater than 72 months.

“The current setting is more for advanced disease,” Kwak explained. “It’s a tougher task, but combined with checkpoint blockade, it may be potent enough to work.” 

Still, caution is important. Despite early promise, it’s too soon to tell which, if any, of these investigational vaccines will pan out in the long run. Like investigational drugs, cancer vaccines may show big promising initially but then fail in larger trials.

One key to success, according to Kwak, is to design trials so that even negative results will inform next steps.

But, he noted, failures in large clinical trials will “put a chilling effect on cancer vaccine research again.”

“That’s what keeps me up at night,” he said. “We know the science is fundamentally sound and we have seen glimpses over decades of research that cancer vaccines can work, so it’s really just a matter of tweaking things to optimize trial design.”

Companies tend to design trials to test if a vaccine works or not, without trying to understand why, he said.

“What we need to do is design those so that we can learn from negative results,” he said. That’s what he and his colleagues attempted to do in their recent trial. “We didn’t just look at clinical results; we’re interrogating the actual tumor environment to understand what worked and didn’t and how to tweak that for the next trial.”

Kwak and his colleagues found, for instance, that the vaccine had a greater effect on B cell–derived tumor cells than on cells of plasma origin, so “the most rational design for the next iteration is to combine the vaccine with agents that work directly against plasma cells,” he explained.

As for what’s next, Kwak said: “We’re just focused on trying to do good science and understand. We’ve seen glimpses of success. That’s where we are.”

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

Vaccines for treating and preventing cancer have long been considered a holy grail in oncology.

But aside from a few notable exceptions — including the human papillomavirus (HPV) vaccine, which has dramatically reduced the incidence of HPV-related cancers, and a Bacillus Calmette-Guerin vaccine, which helps prevent early-stage bladder cancer recurrence — most have failed to deliver.

Following a string of disappointments over the past decade, recent advances in the immunotherapy space are bringing renewed hope for progress.

In an American Association for Cancer Research (AACR) series earlier in 2024, Catherine J. Wu, MD, predicted big strides for cancer vaccines, especially for personalized vaccines that target patient-specific neoantigens — the proteins that form on cancer cells — as well as vaccines that can treat diverse tumor types.

“A focus on neoantigens that arise from driver mutations in different tumor types could allow us to make progress in creating off-the-shelf vaccines,” said Wu, the Lavine Family Chair of Preventative Cancer Therapies at Dana-Farber Cancer Institute and a professor of medicine at Harvard Medical School, both in Boston, Massachusetts.

A prime example is a personalized, messenger RNA (mRNA)–based vaccine designed to prevent melanoma recurrence. The mRNA-4157 vaccine encodes up to 34 different patient-specific neoantigens.

“This is one of the most exciting developments in modern cancer therapy,” said Lawrence Young, a virologist and professor of molecular oncology at the University of Warwick, Coventry, England, who commented on the investigational vaccine via the UK-based Science Media Centre.

Other promising options are on the horizon as well. In August, BioNTech announced a phase 1 global trial to study BNT116 — a vaccine to treat non–small cell lung cancer (NSCLC). BNT116, like mRNA-4157, targets specific antigens in the lung cancer cells.

“This technology is the next big phase of cancer treatment,” Siow Ming Lee, MD, a consultant medical oncologist at University College London Hospitals in England, which is leading the UK trial for the lung cancer and melanoma vaccines, told The Guardian. “We are now entering this very exciting new era of mRNA-based immunotherapy clinical trials to investigate the treatment of lung cancer.”

Still, these predictions have a familiar ring. While the prospects are exciting, delivering on them is another story. There are simply no guarantees these strategies will work as hoped.

 

Then: Where We Were

Cancer vaccine research began to ramp up in the 2000s, and in 2006, the first-generation HPV vaccine, Gardasil, was approved. Gardasil prevents infection from four strains of HPV that cause about 80% of cervical cancer cases.

In 2010, the Food and Drug Administration approved sipuleucel-T, the first therapeutic cancer vaccine, which improved overall survival in patients with hormone-refractory prostate cancer.

Researchers predicted this approval would “pave the way for developing innovative, next generation of vaccines with enhanced antitumor potency.”

In a 2015 AACR research forecast report, Drew Pardoll, MD, PhD, co-director of the Cancer Immunology and Hematopoiesis Program at Johns Hopkins University, Baltimore, Maryland, said that “we can expect to see encouraging results from studies using cancer vaccines.”

Despite the excitement surrounding cancer vaccines alongside a few successes, the next decade brought a longer string of late-phase disappointments.

In 2016, the phase 3 ACT IV trial of a therapeutic vaccine to treat glioblastoma multiforme (CDX-110) was terminated after it failed to demonstrate improved survival.

In 2017, a phase 3 trial of the therapeutic pancreatic cancer vaccine, GVAX, was stopped early for lack of efficacy.

That year, an attenuated Listeria monocytogenes vaccine to treat pancreatic cancer and mesothelioma also failed to come to fruition. In late 2017, concerns over listeria infections prompted Aduro Biotech to cancel its listeria-based cancer treatment program.

In 2018, a phase 3 trial of belagenpumatucel-L, a therapeutic NSCLC vaccine, failed to demonstrate a significant improvement in survival and further study was discontinued.

And in 2019, a vaccine targeting MAGE-A3, a cancer-testis antigen present in multiple tumor types, failed to meet endpoints for improved survival in a phase 3 trial, leading to discontinuation of the vaccine program.

But these disappointments and failures are normal parts of medical research and drug development and have allowed for incremental advances that helped fuel renewed interest and hope for cancer vaccines, when the timing was right, explained vaccine pioneer Larry W. Kwak, MD, PhD, deputy director of the Comprehensive Cancer Center at City of Hope, Duarte, California.

When it comes to vaccine progress, timing makes a difference. In 2011, Kwak and colleagues published promising phase 3 trial results on a personalized vaccine. The vaccine was a patient-specific tumor-derived antigen for patients with follicular lymphoma in their first remission following chemotherapy. Patients who received the vaccine demonstrated significantly longer disease-free survival.

But, at the time, personalized vaccines faced strong headwinds due, largely, to high costs, and commercial interest failed to materialize. “That’s been the major hurdle for a long time,” said Kwak.

Now, however, interest has returned alongside advances in technology and research. The big shift has been the emergence of lower-cost rapid-production mRNA and DNA platforms and a better understanding of how vaccines and potent immune stimulants, like checkpoint inhibitors, can work together to improve outcomes, he explained.

“The timing wasn’t right” back then, Kwak noted. “Now, it’s a different environment and a different time.”

 

A Turning Point?

Indeed, a decade later, cancer vaccine development appears to be headed in a more promising direction.

Among key cancer vaccines to watch is the mRNA-4157 vaccine, developed by Merck and Moderna, designed to prevent melanoma recurrence. In a recent phase 2 study, patients receiving the mRNA-4157 vaccine alongside pembrolizumab had nearly half the risk for melanoma recurrence or death at 3 years compared with those receiving pembrolizumab alone. Investigators are now evaluating the vaccine in a global phase 3 study in patients with high-risk, stage IIB to IV melanoma following surgery.

Another one to watch is the BNT116 NSCLC vaccine from BioNTech. This vaccine presents the immune system with NSCLC tumor markers to encourage the body to fight cancer cells expressing those markers while ignoring healthy cells. BioNTech also launched a global clinical trial for its vaccine this year.

Other notables include a pancreatic cancer mRNA vaccine, which has shown promising early results in a small trial of 16 patients. Of 16 patients who received the vaccine alongside chemotherapy and after surgery and immunotherapy, 8 responded. Of these eight, six remained recurrence free at 3 years. Investigators noted that the vaccine appeared to stimulate a durable T-cell response in patients who responded.

Kwak has also continued his work on lymphoma vaccines. In August, his team published promising first-in-human data on the use of personalized neoantigen vaccines as an early intervention in untreated patients with lymphoplasmacytic lymphoma. Among nine asymptomatic patients who received the vaccine, all achieved stable disease or better, with no dose-limiting toxicities. One patient had a minor response, and the median time to progression was greater than 72 months.

“The current setting is more for advanced disease,” Kwak explained. “It’s a tougher task, but combined with checkpoint blockade, it may be potent enough to work.” 

Still, caution is important. Despite early promise, it’s too soon to tell which, if any, of these investigational vaccines will pan out in the long run. Like investigational drugs, cancer vaccines may show big promising initially but then fail in larger trials.

One key to success, according to Kwak, is to design trials so that even negative results will inform next steps.

But, he noted, failures in large clinical trials will “put a chilling effect on cancer vaccine research again.”

“That’s what keeps me up at night,” he said. “We know the science is fundamentally sound and we have seen glimpses over decades of research that cancer vaccines can work, so it’s really just a matter of tweaking things to optimize trial design.”

Companies tend to design trials to test if a vaccine works or not, without trying to understand why, he said.

“What we need to do is design those so that we can learn from negative results,” he said. That’s what he and his colleagues attempted to do in their recent trial. “We didn’t just look at clinical results; we’re interrogating the actual tumor environment to understand what worked and didn’t and how to tweak that for the next trial.”

Kwak and his colleagues found, for instance, that the vaccine had a greater effect on B cell–derived tumor cells than on cells of plasma origin, so “the most rational design for the next iteration is to combine the vaccine with agents that work directly against plasma cells,” he explained.

As for what’s next, Kwak said: “We’re just focused on trying to do good science and understand. We’ve seen glimpses of success. That’s where we are.”

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

Most US adults continue to plan on skipping an annual COVID vaccine.

About 6 in 10 people say they probably won’t get an updated shot this year, despite the Centers for Disease Control and Prevention’s (CDC) recommendation that everyone do so, according to results of a new survey from the Pew Research Center.

When asked why people wouldn’t get an updated COVID vaccine, 61% said a major reason was that they don’t think they need it, and 60% said a major reason is that they are concerned about side effects. Cost was a factor for 14% of people, and 46% of people said they don’t get vaccines in general.

There were some differences in intention to get vaccinated based on a person’s age. Among people ages 65 and older, 27% said they had already gotten the vaccine, and another 27% said they probably will get the shot, leaving 45% who said they probably won’t roll up their sleeves. People ages 30-49 years old were the least likely to plan on getting a COVID shot – 66% said they probably won’t get one.

Public health officials say everyone should get an annual COVID vaccine, just as they should get a flu shot, because the vaccines are formulated each year to target virus strains predicted to be in wide circulation. Also, immunity – either from past vaccination or past infection – wanes over time. 

Research shows that the vaccines reduce the likelihood of hospitalization or death caused by severe illness, particularly among people who have risk factors, like being over age 65 or having health issues that are becoming increasingly common in the United States, like diabetes, heart problems, and lung conditions.

The survey included 9,593 adults who were asked about their COVID vaccine intentions with this question: “Public health officials recently recommended an updated vaccine for COVID-19. Do you think you will probably get an updated vaccine, probably not get an updated vaccine, or have you already received an updated vaccine?” The survey was done online and by telephone from October 21 to October 27.

So far in 2024, the CDC’s ongoing immunization survey shows that 17% of adults say that, as of November 2, they have gotten vaccinated for COVID-19 this season, and 14% said they will definitely get vaccinated. The Pew Research Center survey found that 15% of people said they’ve already gotten the shot this season.

Reports of positive COVID tests, emergency room visits, and hospitalizations remain very low. About 3.6% of test results shared with the CDC were positive for COVID the week ending November 9. Less than 1% of ER visits involve a COVID diagnosis, and hospitalizations are well below the rate seen at this time last year. Last year, COVID activity in the United States began rising around Thanksgiving and continued upward, peaking in early January.

The protection from a COVID-19 vaccination usually fully kicks in about 2 weeks after you get the shot, and the vaccines are most effective for the following 3 months.

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

Most US adults continue to plan on skipping an annual COVID vaccine.

About 6 in 10 people say they probably won’t get an updated shot this year, despite the Centers for Disease Control and Prevention’s (CDC) recommendation that everyone do so, according to results of a new survey from the Pew Research Center.

When asked why people wouldn’t get an updated COVID vaccine, 61% said a major reason was that they don’t think they need it, and 60% said a major reason is that they are concerned about side effects. Cost was a factor for 14% of people, and 46% of people said they don’t get vaccines in general.

There were some differences in intention to get vaccinated based on a person’s age. Among people ages 65 and older, 27% said they had already gotten the vaccine, and another 27% said they probably will get the shot, leaving 45% who said they probably won’t roll up their sleeves. People ages 30-49 years old were the least likely to plan on getting a COVID shot – 66% said they probably won’t get one.

Public health officials say everyone should get an annual COVID vaccine, just as they should get a flu shot, because the vaccines are formulated each year to target virus strains predicted to be in wide circulation. Also, immunity – either from past vaccination or past infection – wanes over time. 

Research shows that the vaccines reduce the likelihood of hospitalization or death caused by severe illness, particularly among people who have risk factors, like being over age 65 or having health issues that are becoming increasingly common in the United States, like diabetes, heart problems, and lung conditions.

The survey included 9,593 adults who were asked about their COVID vaccine intentions with this question: “Public health officials recently recommended an updated vaccine for COVID-19. Do you think you will probably get an updated vaccine, probably not get an updated vaccine, or have you already received an updated vaccine?” The survey was done online and by telephone from October 21 to October 27.

So far in 2024, the CDC’s ongoing immunization survey shows that 17% of adults say that, as of November 2, they have gotten vaccinated for COVID-19 this season, and 14% said they will definitely get vaccinated. The Pew Research Center survey found that 15% of people said they’ve already gotten the shot this season.

Reports of positive COVID tests, emergency room visits, and hospitalizations remain very low. About 3.6% of test results shared with the CDC were positive for COVID the week ending November 9. Less than 1% of ER visits involve a COVID diagnosis, and hospitalizations are well below the rate seen at this time last year. Last year, COVID activity in the United States began rising around Thanksgiving and continued upward, peaking in early January.

The protection from a COVID-19 vaccination usually fully kicks in about 2 weeks after you get the shot, and the vaccines are most effective for the following 3 months.

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

Most US adults continue to plan on skipping an annual COVID vaccine.

About 6 in 10 people say they probably won’t get an updated shot this year, despite the Centers for Disease Control and Prevention’s (CDC) recommendation that everyone do so, according to results of a new survey from the Pew Research Center.

When asked why people wouldn’t get an updated COVID vaccine, 61% said a major reason was that they don’t think they need it, and 60% said a major reason is that they are concerned about side effects. Cost was a factor for 14% of people, and 46% of people said they don’t get vaccines in general.

There were some differences in intention to get vaccinated based on a person’s age. Among people ages 65 and older, 27% said they had already gotten the vaccine, and another 27% said they probably will get the shot, leaving 45% who said they probably won’t roll up their sleeves. People ages 30-49 years old were the least likely to plan on getting a COVID shot – 66% said they probably won’t get one.

Public health officials say everyone should get an annual COVID vaccine, just as they should get a flu shot, because the vaccines are formulated each year to target virus strains predicted to be in wide circulation. Also, immunity – either from past vaccination or past infection – wanes over time. 

Research shows that the vaccines reduce the likelihood of hospitalization or death caused by severe illness, particularly among people who have risk factors, like being over age 65 or having health issues that are becoming increasingly common in the United States, like diabetes, heart problems, and lung conditions.

The survey included 9,593 adults who were asked about their COVID vaccine intentions with this question: “Public health officials recently recommended an updated vaccine for COVID-19. Do you think you will probably get an updated vaccine, probably not get an updated vaccine, or have you already received an updated vaccine?” The survey was done online and by telephone from October 21 to October 27.

So far in 2024, the CDC’s ongoing immunization survey shows that 17% of adults say that, as of November 2, they have gotten vaccinated for COVID-19 this season, and 14% said they will definitely get vaccinated. The Pew Research Center survey found that 15% of people said they’ve already gotten the shot this season.

Reports of positive COVID tests, emergency room visits, and hospitalizations remain very low. About 3.6% of test results shared with the CDC were positive for COVID the week ending November 9. Less than 1% of ER visits involve a COVID diagnosis, and hospitalizations are well below the rate seen at this time last year. Last year, COVID activity in the United States began rising around Thanksgiving and continued upward, peaking in early January.

The protection from a COVID-19 vaccination usually fully kicks in about 2 weeks after you get the shot, and the vaccines are most effective for the following 3 months.

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

Six times as many cases of pertussis were reported in the United States for the week ending November 16, 2024, as the same week in 2023, according to new data from the Centers for Disease Control and Prevention (CDC).

The numbers reflect a return to prepandemic trends, but overall, pertussis cases for 2024 so far have surpassed those seen prior to the pandemic in 2019, according to the CDC.

Of the 434 cases reported for the week ending November 16, 2024, a majority (109) occurred in the East North Central region, mostly in Ohio (93). Another 70 cases occurred in the West North Central region, with 32 cases and 37 cases in Missouri and Nebraska, respectively.

None of the 75 cases in the Middle Atlantic region occurred in New Jersey or New York City; 38 were reported elsewhere in New York, and 37 in Pennsylvania. The South Atlantic region reported 55 cases, including 29 in Florida. The East South Central and West South Central regions reported 11 and 20 cases, respectively. The Mountain and Pacific regions reported 31 (20 in Arizona) and 47 (20 in Washington State) cases, respectively.

The CDC tracks pertussis cases through a national surveillance system, but many cases are likely unrecognized and unreported, according to the CDC.

Although vaccines for pertussis (whooping cough) provide protection, their effectiveness decreases over time, and the CDC expects rates to increase in vaccinated and unvaccinated populations as case levels rebound with the lifting of pandemic mitigation strategies such as masking and remote learning.

Recent CDC data reported by Medscape Medical News showed an association between lower vaccination rates and 2024’s uptick in pertussis cases.

 

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

Six times as many cases of pertussis were reported in the United States for the week ending November 16, 2024, as the same week in 2023, according to new data from the Centers for Disease Control and Prevention (CDC).

The numbers reflect a return to prepandemic trends, but overall, pertussis cases for 2024 so far have surpassed those seen prior to the pandemic in 2019, according to the CDC.

Of the 434 cases reported for the week ending November 16, 2024, a majority (109) occurred in the East North Central region, mostly in Ohio (93). Another 70 cases occurred in the West North Central region, with 32 cases and 37 cases in Missouri and Nebraska, respectively.

None of the 75 cases in the Middle Atlantic region occurred in New Jersey or New York City; 38 were reported elsewhere in New York, and 37 in Pennsylvania. The South Atlantic region reported 55 cases, including 29 in Florida. The East South Central and West South Central regions reported 11 and 20 cases, respectively. The Mountain and Pacific regions reported 31 (20 in Arizona) and 47 (20 in Washington State) cases, respectively.

The CDC tracks pertussis cases through a national surveillance system, but many cases are likely unrecognized and unreported, according to the CDC.

Although vaccines for pertussis (whooping cough) provide protection, their effectiveness decreases over time, and the CDC expects rates to increase in vaccinated and unvaccinated populations as case levels rebound with the lifting of pandemic mitigation strategies such as masking and remote learning.

Recent CDC data reported by Medscape Medical News showed an association between lower vaccination rates and 2024’s uptick in pertussis cases.

 

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

Six times as many cases of pertussis were reported in the United States for the week ending November 16, 2024, as the same week in 2023, according to new data from the Centers for Disease Control and Prevention (CDC).

The numbers reflect a return to prepandemic trends, but overall, pertussis cases for 2024 so far have surpassed those seen prior to the pandemic in 2019, according to the CDC.

Of the 434 cases reported for the week ending November 16, 2024, a majority (109) occurred in the East North Central region, mostly in Ohio (93). Another 70 cases occurred in the West North Central region, with 32 cases and 37 cases in Missouri and Nebraska, respectively.

None of the 75 cases in the Middle Atlantic region occurred in New Jersey or New York City; 38 were reported elsewhere in New York, and 37 in Pennsylvania. The South Atlantic region reported 55 cases, including 29 in Florida. The East South Central and West South Central regions reported 11 and 20 cases, respectively. The Mountain and Pacific regions reported 31 (20 in Arizona) and 47 (20 in Washington State) cases, respectively.

The CDC tracks pertussis cases through a national surveillance system, but many cases are likely unrecognized and unreported, according to the CDC.

Although vaccines for pertussis (whooping cough) provide protection, their effectiveness decreases over time, and the CDC expects rates to increase in vaccinated and unvaccinated populations as case levels rebound with the lifting of pandemic mitigation strategies such as masking and remote learning.

Recent CDC data reported by Medscape Medical News showed an association between lower vaccination rates and 2024’s uptick in pertussis cases.

 

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