Brenda Goodman, MA

People who get COVID-19 infections caused by the Omicron variant are less likely to need hospital care, compared with those infected by the Delta variant, according to two large new studies from the U.K. and South Africa.

The findings, which were released ahead of peer review, add to previous glimmers of evidence suggesting that Omicron – while extremely contagious -– may result in less severe symptoms than its predecessors.

“This is helping us quantify how much less severe Omicron is than Delta, and it appears to be between 40 to 75% reduced risk of hospitalizations, adjusted for many factors, which is very good,” said Eric Topol, MD, the editor-in-chief of Medscape and a cardiologist at Scripps Research Translational Institute in La Jolla, CA.

The first analysis, which was done by the World Health Organization Collaborating Centre for Infectious Disease Modelling and Imperial College London, found that overall, people infected by Omicron had about a 20% reduced risk of needing any hospital care for their infections and a 40% lower risk of an overnight hospital stay, compared to those infected with Delta.

Meanwhile, people who were re-infected – meaning they caught Omicron after recovering from a previous COVID-19 infection – had a 50%-60% lower risk of needing hospital care, likely reflecting the benefits of having some prior immunity against the same family of viruses.

The study included everyone with polymerase chain reaction-confirmed COVID-19 in the U.K. during the first 2 weeks of December – roughly 56,000 Omicron cases and 269,000 Delta infections.

The second study, from researchers at the National Institute for Communicable Diseases in South Africa, included more than 29,000 COVID-19 cases that had lab results highly suggestive of Omicron infections. Compared to people infected with the Delta variant, those with presumed Omicron infections were about 70% less likely to have severe disease.

While the news is hopeful for individuals, on a population level, health care systems may still be stressed, the study authors warned.

“Given the high transmissibility of the Omicron virus, there remains the potential for health services to face increasing demand if Omicron cases continue to grow at the rate that has been seen in recent weeks,” said study author Neil Ferguson, PhD, who studies how infectious diseases spread at Imperial College London.

The study authors say their findings are specific to the U.K. and South Africa, where substantial portions of the population have some immune protection from past infection. In other words, they may not apply to countries where fewer people have been vaccinated or recovered from a bout with COVID-19.

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

People who get COVID-19 infections caused by the Omicron variant are less likely to need hospital care, compared with those infected by the Delta variant, according to two large new studies from the U.K. and South Africa.

The findings, which were released ahead of peer review, add to previous glimmers of evidence suggesting that Omicron – while extremely contagious -– may result in less severe symptoms than its predecessors.

“This is helping us quantify how much less severe Omicron is than Delta, and it appears to be between 40 to 75% reduced risk of hospitalizations, adjusted for many factors, which is very good,” said Eric Topol, MD, the editor-in-chief of Medscape and a cardiologist at Scripps Research Translational Institute in La Jolla, CA.

The first analysis, which was done by the World Health Organization Collaborating Centre for Infectious Disease Modelling and Imperial College London, found that overall, people infected by Omicron had about a 20% reduced risk of needing any hospital care for their infections and a 40% lower risk of an overnight hospital stay, compared to those infected with Delta.

Meanwhile, people who were re-infected – meaning they caught Omicron after recovering from a previous COVID-19 infection – had a 50%-60% lower risk of needing hospital care, likely reflecting the benefits of having some prior immunity against the same family of viruses.

The study included everyone with polymerase chain reaction-confirmed COVID-19 in the U.K. during the first 2 weeks of December – roughly 56,000 Omicron cases and 269,000 Delta infections.

The second study, from researchers at the National Institute for Communicable Diseases in South Africa, included more than 29,000 COVID-19 cases that had lab results highly suggestive of Omicron infections. Compared to people infected with the Delta variant, those with presumed Omicron infections were about 70% less likely to have severe disease.

While the news is hopeful for individuals, on a population level, health care systems may still be stressed, the study authors warned.

“Given the high transmissibility of the Omicron virus, there remains the potential for health services to face increasing demand if Omicron cases continue to grow at the rate that has been seen in recent weeks,” said study author Neil Ferguson, PhD, who studies how infectious diseases spread at Imperial College London.

The study authors say their findings are specific to the U.K. and South Africa, where substantial portions of the population have some immune protection from past infection. In other words, they may not apply to countries where fewer people have been vaccinated or recovered from a bout with COVID-19.

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

People who get COVID-19 infections caused by the Omicron variant are less likely to need hospital care, compared with those infected by the Delta variant, according to two large new studies from the U.K. and South Africa.

The findings, which were released ahead of peer review, add to previous glimmers of evidence suggesting that Omicron – while extremely contagious -– may result in less severe symptoms than its predecessors.

“This is helping us quantify how much less severe Omicron is than Delta, and it appears to be between 40 to 75% reduced risk of hospitalizations, adjusted for many factors, which is very good,” said Eric Topol, MD, the editor-in-chief of Medscape and a cardiologist at Scripps Research Translational Institute in La Jolla, CA.

The first analysis, which was done by the World Health Organization Collaborating Centre for Infectious Disease Modelling and Imperial College London, found that overall, people infected by Omicron had about a 20% reduced risk of needing any hospital care for their infections and a 40% lower risk of an overnight hospital stay, compared to those infected with Delta.

Meanwhile, people who were re-infected – meaning they caught Omicron after recovering from a previous COVID-19 infection – had a 50%-60% lower risk of needing hospital care, likely reflecting the benefits of having some prior immunity against the same family of viruses.

The study included everyone with polymerase chain reaction-confirmed COVID-19 in the U.K. during the first 2 weeks of December – roughly 56,000 Omicron cases and 269,000 Delta infections.

The second study, from researchers at the National Institute for Communicable Diseases in South Africa, included more than 29,000 COVID-19 cases that had lab results highly suggestive of Omicron infections. Compared to people infected with the Delta variant, those with presumed Omicron infections were about 70% less likely to have severe disease.

While the news is hopeful for individuals, on a population level, health care systems may still be stressed, the study authors warned.

“Given the high transmissibility of the Omicron virus, there remains the potential for health services to face increasing demand if Omicron cases continue to grow at the rate that has been seen in recent weeks,” said study author Neil Ferguson, PhD, who studies how infectious diseases spread at Imperial College London.

The study authors say their findings are specific to the U.K. and South Africa, where substantial portions of the population have some immune protection from past infection. In other words, they may not apply to countries where fewer people have been vaccinated or recovered from a bout with COVID-19.

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

Pfizer’s COVID-19 vaccine for children ages 2 to 5 years old fizzled in clinical trials, the company said on Friday, signaling a further delay in getting a vaccine to preschoolers just as Omicron bears down on the U.S.

In a news release, Pfizer reported that while its 3-microgram dose – which is less than one-third of the dose given to older children – generated a protective immune response in babies and toddlers ages 6 to 24 months, it didn’t generate adequate immunity in children ages 2 to 5.

The company plans to change its clinical trial to add a third dose for younger children in hopes of improving those results. It also plans to test a third dose of its 10-microgram vaccine for children ages 5 to 12.

If the trials are successful, Pfizer said it would submit data to the FDA for an emergency use authorization (EUA) in the first half of 2022.

That pushes the timeline of getting a vaccine to younger children back by several months. In November, Anthony Fauci, MD, head of the National Institute of Allergy Infectious Diseases, predicted a vaccine would be ready for preschoolers by spring.

“On one hand, parents are understandably disappointed,” said Jill Foster, MD, a pediatric infectious disease doctor at the University of Minnesota Medical School. “On the other, it shows that the system for testing vaccines is working. Children are not little adults and have complex immune systems, so it’s not just a matter of making the dose smaller and expecting that it will work,” she said, noting that data from Moderna’s KidCOVE study in preschoolers is pending.

Until there’s a vaccine, Dr. Foster says parents should protect babies and toddlers by making sure everyone around them is vaccinated, promote the use of face masks for everyone around them and for all children over age 2, and continue to avoid crowded gatherings, particularly those that are indoors.

“Hand sanitizer is important, but this virus, especially the Omicron variant, is very easily spread through the air, so keep the air clear of virus as much as possible,” she said.

While the youngest children are still waiting for an effective vaccine, there was reassuring news Dec. 16 about the safety of Pfizer’s vaccine for school-aged kids – those ages 5 through 11.

Out of more than 7 million doses given since this vaccine was authorized for emergency use in late October, most reactions to the vaccine – including arm pain, swelling, and fatigue – have been mild and gone away quickly, without the need to miss school or see a doctor, the CDC reported to a meeting of its Advisory Committee on Immunization Practices, or ACIP.

Many experts had been waiting to see if this vaccine would cause rare cases of heart inflammation called myocarditis, as a higher dose did in teens and young adults.

The news on this front was excellent. About 6 weeks after this vaccine became available, the CDC says there have been only eight confirmed cases of myocarditis in this age group. Six more cases are under investigation.

To put this risk into context, data collected by the American Academy of Pediatrics and the Children’s Hospital Association shows that about 1% of children who test positive for COVID-19 are hospitalized for their infections, while the risk of getting a case of myocarditis after vaccination is .0002%, making it about 5,000 times more likely that a child would need to be hospitalized for COVID-19 than for myocarditis after vaccination.

John Su, MD, who is a member of the CDC’s Vaccine Safety Team, reported there had been two deaths in children after a COVID-19 vaccination. Both were girls, ages 5 and 6. Both had complicated medical histories for several medical disorders. It’s not clear their deaths were linked to the vaccine, and the causes of their deaths are still under investigation.

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

Pfizer’s COVID-19 vaccine for children ages 2 to 5 years old fizzled in clinical trials, the company said on Friday, signaling a further delay in getting a vaccine to preschoolers just as Omicron bears down on the U.S.

In a news release, Pfizer reported that while its 3-microgram dose – which is less than one-third of the dose given to older children – generated a protective immune response in babies and toddlers ages 6 to 24 months, it didn’t generate adequate immunity in children ages 2 to 5.

The company plans to change its clinical trial to add a third dose for younger children in hopes of improving those results. It also plans to test a third dose of its 10-microgram vaccine for children ages 5 to 12.

If the trials are successful, Pfizer said it would submit data to the FDA for an emergency use authorization (EUA) in the first half of 2022.

That pushes the timeline of getting a vaccine to younger children back by several months. In November, Anthony Fauci, MD, head of the National Institute of Allergy Infectious Diseases, predicted a vaccine would be ready for preschoolers by spring.

“On one hand, parents are understandably disappointed,” said Jill Foster, MD, a pediatric infectious disease doctor at the University of Minnesota Medical School. “On the other, it shows that the system for testing vaccines is working. Children are not little adults and have complex immune systems, so it’s not just a matter of making the dose smaller and expecting that it will work,” she said, noting that data from Moderna’s KidCOVE study in preschoolers is pending.

Until there’s a vaccine, Dr. Foster says parents should protect babies and toddlers by making sure everyone around them is vaccinated, promote the use of face masks for everyone around them and for all children over age 2, and continue to avoid crowded gatherings, particularly those that are indoors.

“Hand sanitizer is important, but this virus, especially the Omicron variant, is very easily spread through the air, so keep the air clear of virus as much as possible,” she said.

While the youngest children are still waiting for an effective vaccine, there was reassuring news Dec. 16 about the safety of Pfizer’s vaccine for school-aged kids – those ages 5 through 11.

Out of more than 7 million doses given since this vaccine was authorized for emergency use in late October, most reactions to the vaccine – including arm pain, swelling, and fatigue – have been mild and gone away quickly, without the need to miss school or see a doctor, the CDC reported to a meeting of its Advisory Committee on Immunization Practices, or ACIP.

Many experts had been waiting to see if this vaccine would cause rare cases of heart inflammation called myocarditis, as a higher dose did in teens and young adults.

The news on this front was excellent. About 6 weeks after this vaccine became available, the CDC says there have been only eight confirmed cases of myocarditis in this age group. Six more cases are under investigation.

To put this risk into context, data collected by the American Academy of Pediatrics and the Children’s Hospital Association shows that about 1% of children who test positive for COVID-19 are hospitalized for their infections, while the risk of getting a case of myocarditis after vaccination is .0002%, making it about 5,000 times more likely that a child would need to be hospitalized for COVID-19 than for myocarditis after vaccination.

John Su, MD, who is a member of the CDC’s Vaccine Safety Team, reported there had been two deaths in children after a COVID-19 vaccination. Both were girls, ages 5 and 6. Both had complicated medical histories for several medical disorders. It’s not clear their deaths were linked to the vaccine, and the causes of their deaths are still under investigation.

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

Pfizer’s COVID-19 vaccine for children ages 2 to 5 years old fizzled in clinical trials, the company said on Friday, signaling a further delay in getting a vaccine to preschoolers just as Omicron bears down on the U.S.

In a news release, Pfizer reported that while its 3-microgram dose – which is less than one-third of the dose given to older children – generated a protective immune response in babies and toddlers ages 6 to 24 months, it didn’t generate adequate immunity in children ages 2 to 5.

The company plans to change its clinical trial to add a third dose for younger children in hopes of improving those results. It also plans to test a third dose of its 10-microgram vaccine for children ages 5 to 12.

If the trials are successful, Pfizer said it would submit data to the FDA for an emergency use authorization (EUA) in the first half of 2022.

That pushes the timeline of getting a vaccine to younger children back by several months. In November, Anthony Fauci, MD, head of the National Institute of Allergy Infectious Diseases, predicted a vaccine would be ready for preschoolers by spring.

“On one hand, parents are understandably disappointed,” said Jill Foster, MD, a pediatric infectious disease doctor at the University of Minnesota Medical School. “On the other, it shows that the system for testing vaccines is working. Children are not little adults and have complex immune systems, so it’s not just a matter of making the dose smaller and expecting that it will work,” she said, noting that data from Moderna’s KidCOVE study in preschoolers is pending.

Until there’s a vaccine, Dr. Foster says parents should protect babies and toddlers by making sure everyone around them is vaccinated, promote the use of face masks for everyone around them and for all children over age 2, and continue to avoid crowded gatherings, particularly those that are indoors.

“Hand sanitizer is important, but this virus, especially the Omicron variant, is very easily spread through the air, so keep the air clear of virus as much as possible,” she said.

While the youngest children are still waiting for an effective vaccine, there was reassuring news Dec. 16 about the safety of Pfizer’s vaccine for school-aged kids – those ages 5 through 11.

Out of more than 7 million doses given since this vaccine was authorized for emergency use in late October, most reactions to the vaccine – including arm pain, swelling, and fatigue – have been mild and gone away quickly, without the need to miss school or see a doctor, the CDC reported to a meeting of its Advisory Committee on Immunization Practices, or ACIP.

Many experts had been waiting to see if this vaccine would cause rare cases of heart inflammation called myocarditis, as a higher dose did in teens and young adults.

The news on this front was excellent. About 6 weeks after this vaccine became available, the CDC says there have been only eight confirmed cases of myocarditis in this age group. Six more cases are under investigation.

To put this risk into context, data collected by the American Academy of Pediatrics and the Children’s Hospital Association shows that about 1% of children who test positive for COVID-19 are hospitalized for their infections, while the risk of getting a case of myocarditis after vaccination is .0002%, making it about 5,000 times more likely that a child would need to be hospitalized for COVID-19 than for myocarditis after vaccination.

John Su, MD, who is a member of the CDC’s Vaccine Safety Team, reported there had been two deaths in children after a COVID-19 vaccination. Both were girls, ages 5 and 6. Both had complicated medical histories for several medical disorders. It’s not clear their deaths were linked to the vaccine, and the causes of their deaths are still under investigation.

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

A panel of experts that advises the Centers for Disease Control and Prevention on the use of vaccines said the Pfizer and Moderna mRNA COVID-19 vaccines should be the preferred shots for adults in the United States because the Johnson & Johnson shot carries the risk of a rare but potentially fatal side effect that causes blood clots and bleeding in the brain.

In an emergency meeting on December 16, the CDC’s Advisory Committee on Immunization Practices, or ACIP, voted unanimously (15-0) to state a preference for the mRNA vaccines over the Johnson & Johnson shot. The vote came after the panel heard a safety update on cases of thrombosis with thrombocytopenia syndrome, or TTS, a condition that causes large clots that deplete the blood of platelets, resulting in uncontrolled bleeding.

The move brings the United States in line with other wealthy countries. In May, Denmark dropped the Johnson & Johnson shot from its vaccination program because of this risk. Australia and Greece have limited the use of a similar vaccine, made by AstraZeneca, in younger people because of the TTS risk. Both vaccines use the envelope of a different kind of virus, called an adenovirus, to sneak the vaccine instructions into cells. On Dec. 16, health officials said they had determined that TTS was likely due to a class effect, meaning it happens with all adenovirus vector vaccines.

The risk of dying from TTS after a Johnson & Johnson shot is extremely rare. There is an estimated 1 death for every 2 million doses of the vaccine given in the general population. That risk is higher for women ages 30 to 49, rising to about 2 deaths for every 1 million doses given in this age group. There’s no question that the Johnson & Johnson shot has saved many more lives than it has taken, experts said

Still, the committee previously paused the use of the Johnson & Johnson vaccine in April after the first cases of TTS came to light. That pause was lifted just 10 days later, after a new warning was added to the vaccine’s label to raise awareness of the risk.

In updating the safety information on Johnson & Johnson, the panel noted that the warning label had not sufficiently lowered the risk of death from TTS. Doctors seem to be aware of the condition because none of the patients who had developed TTS had been treated with the blood thinner heparin, which can make the syndrome worse. But patients continued to die even after the label was added, the panel noted, because TTS can progress so quickly that doctors simply don’t have time to treat it.

For that reason, and because there are other, safer vaccines available, the panel decided to make what’s called a preferential statement, saying the Pfizer and Moderna mRNA vaccines should be preferred over Johnson & Johnson.

The statement leaves the J&J vaccine on the market and available to patients who are at risk of a severe allergic reaction to the mRNA vaccines. It also means that people can still choose the J&J vaccine if they still want it after being informed about the risks.

About 17 million first doses and 900,000 second doses of the Johnson & Johnson vaccine have been given in the United States. Through the end of August, 54 cases of thrombosis with thrombocytopenia syndrome (TTS) have occurred after the J&J shots in the United States. Nearly half of those were in women ages 30 to 49. There have been nine deaths from TTS after Johnson & Johnson shots.

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

A panel of experts that advises the Centers for Disease Control and Prevention on the use of vaccines said the Pfizer and Moderna mRNA COVID-19 vaccines should be the preferred shots for adults in the United States because the Johnson & Johnson shot carries the risk of a rare but potentially fatal side effect that causes blood clots and bleeding in the brain.

In an emergency meeting on December 16, the CDC’s Advisory Committee on Immunization Practices, or ACIP, voted unanimously (15-0) to state a preference for the mRNA vaccines over the Johnson & Johnson shot. The vote came after the panel heard a safety update on cases of thrombosis with thrombocytopenia syndrome, or TTS, a condition that causes large clots that deplete the blood of platelets, resulting in uncontrolled bleeding.

The move brings the United States in line with other wealthy countries. In May, Denmark dropped the Johnson & Johnson shot from its vaccination program because of this risk. Australia and Greece have limited the use of a similar vaccine, made by AstraZeneca, in younger people because of the TTS risk. Both vaccines use the envelope of a different kind of virus, called an adenovirus, to sneak the vaccine instructions into cells. On Dec. 16, health officials said they had determined that TTS was likely due to a class effect, meaning it happens with all adenovirus vector vaccines.

The risk of dying from TTS after a Johnson & Johnson shot is extremely rare. There is an estimated 1 death for every 2 million doses of the vaccine given in the general population. That risk is higher for women ages 30 to 49, rising to about 2 deaths for every 1 million doses given in this age group. There’s no question that the Johnson & Johnson shot has saved many more lives than it has taken, experts said

Still, the committee previously paused the use of the Johnson & Johnson vaccine in April after the first cases of TTS came to light. That pause was lifted just 10 days later, after a new warning was added to the vaccine’s label to raise awareness of the risk.

In updating the safety information on Johnson & Johnson, the panel noted that the warning label had not sufficiently lowered the risk of death from TTS. Doctors seem to be aware of the condition because none of the patients who had developed TTS had been treated with the blood thinner heparin, which can make the syndrome worse. But patients continued to die even after the label was added, the panel noted, because TTS can progress so quickly that doctors simply don’t have time to treat it.

For that reason, and because there are other, safer vaccines available, the panel decided to make what’s called a preferential statement, saying the Pfizer and Moderna mRNA vaccines should be preferred over Johnson & Johnson.

The statement leaves the J&J vaccine on the market and available to patients who are at risk of a severe allergic reaction to the mRNA vaccines. It also means that people can still choose the J&J vaccine if they still want it after being informed about the risks.

About 17 million first doses and 900,000 second doses of the Johnson & Johnson vaccine have been given in the United States. Through the end of August, 54 cases of thrombosis with thrombocytopenia syndrome (TTS) have occurred after the J&J shots in the United States. Nearly half of those were in women ages 30 to 49. There have been nine deaths from TTS after Johnson & Johnson shots.

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

A panel of experts that advises the Centers for Disease Control and Prevention on the use of vaccines said the Pfizer and Moderna mRNA COVID-19 vaccines should be the preferred shots for adults in the United States because the Johnson & Johnson shot carries the risk of a rare but potentially fatal side effect that causes blood clots and bleeding in the brain.

In an emergency meeting on December 16, the CDC’s Advisory Committee on Immunization Practices, or ACIP, voted unanimously (15-0) to state a preference for the mRNA vaccines over the Johnson & Johnson shot. The vote came after the panel heard a safety update on cases of thrombosis with thrombocytopenia syndrome, or TTS, a condition that causes large clots that deplete the blood of platelets, resulting in uncontrolled bleeding.

The move brings the United States in line with other wealthy countries. In May, Denmark dropped the Johnson & Johnson shot from its vaccination program because of this risk. Australia and Greece have limited the use of a similar vaccine, made by AstraZeneca, in younger people because of the TTS risk. Both vaccines use the envelope of a different kind of virus, called an adenovirus, to sneak the vaccine instructions into cells. On Dec. 16, health officials said they had determined that TTS was likely due to a class effect, meaning it happens with all adenovirus vector vaccines.

The risk of dying from TTS after a Johnson & Johnson shot is extremely rare. There is an estimated 1 death for every 2 million doses of the vaccine given in the general population. That risk is higher for women ages 30 to 49, rising to about 2 deaths for every 1 million doses given in this age group. There’s no question that the Johnson & Johnson shot has saved many more lives than it has taken, experts said

Still, the committee previously paused the use of the Johnson & Johnson vaccine in April after the first cases of TTS came to light. That pause was lifted just 10 days later, after a new warning was added to the vaccine’s label to raise awareness of the risk.

In updating the safety information on Johnson & Johnson, the panel noted that the warning label had not sufficiently lowered the risk of death from TTS. Doctors seem to be aware of the condition because none of the patients who had developed TTS had been treated with the blood thinner heparin, which can make the syndrome worse. But patients continued to die even after the label was added, the panel noted, because TTS can progress so quickly that doctors simply don’t have time to treat it.

For that reason, and because there are other, safer vaccines available, the panel decided to make what’s called a preferential statement, saying the Pfizer and Moderna mRNA vaccines should be preferred over Johnson & Johnson.

The statement leaves the J&J vaccine on the market and available to patients who are at risk of a severe allergic reaction to the mRNA vaccines. It also means that people can still choose the J&J vaccine if they still want it after being informed about the risks.

About 17 million first doses and 900,000 second doses of the Johnson & Johnson vaccine have been given in the United States. Through the end of August, 54 cases of thrombosis with thrombocytopenia syndrome (TTS) have occurred after the J&J shots in the United States. Nearly half of those were in women ages 30 to 49. There have been nine deaths from TTS after Johnson & Johnson shots.

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

The Food and Drug Administration has authorized booster doses of Pfizer’s COVID-19 vaccine, clearing the way for millions of teenagers to get a third dose of vaccine starting 6 months after their second dose.

The FDA said it was basing its emergency authorization of boosters for 16- and 17-year-olds on data from 200 individuals who were 18-55 years of age when they received a booster dose. They are requiring Pfizer to collect data on safety in postauthorization studies.

“The FDA has determined that the benefits of a single booster dose of the Pfizer-BioNTech COVID-19 Vaccine or Comirnaty outweigh the risks of myocarditis and pericarditis in individuals 16 and 17 years of age to provide continued protection against COVID-19 and the associated serious consequences that can occur including hospitalization and death,” the agency said in a news release.

Israel has been giving booster doses of Pfizer’s vaccine to everyone 12 and up since late August. Data from that country show that myocarditis cases continue to be very rare, even in younger age groups, and are mild and temporary.

The authorization comes as the effectiveness of the current vaccines against the new Omicron variant has become a point of intense scientific inquiry.

Early studies suggest that booster doses may be necessary to keep Omicron at bay, at least until new variant-specific vaccines are ready next spring.

Current evidence suggests that the protection of the vaccines is holding up well against severe disease and death, at least with Delta and early iterations of the virus.

How well they will do against Omicron, and how severe Omicron infections may be for different age groups, remain open questions.

On Dec. 8, the World Health Organization urged countries not to wait for all the science to come in, but to act now to contain any potential threat.

The first pieces of evidence on Omicron suggest that it is highly contagious, perhaps even more than Delta, though early reports suggest symptoms caused by this version of the new coronavirus may be less severe than in previous waves. Experts have cautioned that the true severity of Omicron infections isn’t yet known, since the first cases have been detected in younger people, who tend to have milder COVID-19 symptoms than those of adults and seniors.

“Vaccination and getting a booster when eligible, along with other preventive measures like masking and avoiding large crowds and poorly ventilated spaces, remain our most effective methods for fighting COVID-19,” Acting FDA Commissioner Janet Woodcock, MD, said in a news release. “As people gather indoors with family and friends for the holidays, we can’t let up on all the preventive public health measures that we have been taking during the pandemic. With both the Delta and Omicron variants continuing to spread, vaccination remains the best protection against COVID-19.”

In mid-November, the FDA authorized boosters of the Pfizer vaccine for all individuals 18 and older, but the agency held off on expanding the use of boosters for younger age groups, partly because they have the highest risk of myocarditis, a very rare side effect.

Myocarditis cases seem to be temporary, with patients making a full recovery, though they need to be monitored in the hospital. The risk of myocarditis with a COVID-19 infection is many times higher than it is from a vaccine.

There have been little data to support the need for boosters in this age group, because children and teens tend to experience milder COVID-19 disease, though they are still at risk for post–COVID-19 complications such as long COVID and a delayed reaction to the virus called Post Acute Sequelae of SARS-CoV2 Infection among Children, or PAS-C.

All that changed with the arrival of Omicron.

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

The Food and Drug Administration has authorized booster doses of Pfizer’s COVID-19 vaccine, clearing the way for millions of teenagers to get a third dose of vaccine starting 6 months after their second dose.

The FDA said it was basing its emergency authorization of boosters for 16- and 17-year-olds on data from 200 individuals who were 18-55 years of age when they received a booster dose. They are requiring Pfizer to collect data on safety in postauthorization studies.

“The FDA has determined that the benefits of a single booster dose of the Pfizer-BioNTech COVID-19 Vaccine or Comirnaty outweigh the risks of myocarditis and pericarditis in individuals 16 and 17 years of age to provide continued protection against COVID-19 and the associated serious consequences that can occur including hospitalization and death,” the agency said in a news release.

Israel has been giving booster doses of Pfizer’s vaccine to everyone 12 and up since late August. Data from that country show that myocarditis cases continue to be very rare, even in younger age groups, and are mild and temporary.

The authorization comes as the effectiveness of the current vaccines against the new Omicron variant has become a point of intense scientific inquiry.

Early studies suggest that booster doses may be necessary to keep Omicron at bay, at least until new variant-specific vaccines are ready next spring.

Current evidence suggests that the protection of the vaccines is holding up well against severe disease and death, at least with Delta and early iterations of the virus.

How well they will do against Omicron, and how severe Omicron infections may be for different age groups, remain open questions.

On Dec. 8, the World Health Organization urged countries not to wait for all the science to come in, but to act now to contain any potential threat.

The first pieces of evidence on Omicron suggest that it is highly contagious, perhaps even more than Delta, though early reports suggest symptoms caused by this version of the new coronavirus may be less severe than in previous waves. Experts have cautioned that the true severity of Omicron infections isn’t yet known, since the first cases have been detected in younger people, who tend to have milder COVID-19 symptoms than those of adults and seniors.

“Vaccination and getting a booster when eligible, along with other preventive measures like masking and avoiding large crowds and poorly ventilated spaces, remain our most effective methods for fighting COVID-19,” Acting FDA Commissioner Janet Woodcock, MD, said in a news release. “As people gather indoors with family and friends for the holidays, we can’t let up on all the preventive public health measures that we have been taking during the pandemic. With both the Delta and Omicron variants continuing to spread, vaccination remains the best protection against COVID-19.”

In mid-November, the FDA authorized boosters of the Pfizer vaccine for all individuals 18 and older, but the agency held off on expanding the use of boosters for younger age groups, partly because they have the highest risk of myocarditis, a very rare side effect.

Myocarditis cases seem to be temporary, with patients making a full recovery, though they need to be monitored in the hospital. The risk of myocarditis with a COVID-19 infection is many times higher than it is from a vaccine.

There have been little data to support the need for boosters in this age group, because children and teens tend to experience milder COVID-19 disease, though they are still at risk for post–COVID-19 complications such as long COVID and a delayed reaction to the virus called Post Acute Sequelae of SARS-CoV2 Infection among Children, or PAS-C.

All that changed with the arrival of Omicron.

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

The Food and Drug Administration has authorized booster doses of Pfizer’s COVID-19 vaccine, clearing the way for millions of teenagers to get a third dose of vaccine starting 6 months after their second dose.

The FDA said it was basing its emergency authorization of boosters for 16- and 17-year-olds on data from 200 individuals who were 18-55 years of age when they received a booster dose. They are requiring Pfizer to collect data on safety in postauthorization studies.

“The FDA has determined that the benefits of a single booster dose of the Pfizer-BioNTech COVID-19 Vaccine or Comirnaty outweigh the risks of myocarditis and pericarditis in individuals 16 and 17 years of age to provide continued protection against COVID-19 and the associated serious consequences that can occur including hospitalization and death,” the agency said in a news release.

Israel has been giving booster doses of Pfizer’s vaccine to everyone 12 and up since late August. Data from that country show that myocarditis cases continue to be very rare, even in younger age groups, and are mild and temporary.

The authorization comes as the effectiveness of the current vaccines against the new Omicron variant has become a point of intense scientific inquiry.

Early studies suggest that booster doses may be necessary to keep Omicron at bay, at least until new variant-specific vaccines are ready next spring.

Current evidence suggests that the protection of the vaccines is holding up well against severe disease and death, at least with Delta and early iterations of the virus.

How well they will do against Omicron, and how severe Omicron infections may be for different age groups, remain open questions.

On Dec. 8, the World Health Organization urged countries not to wait for all the science to come in, but to act now to contain any potential threat.

The first pieces of evidence on Omicron suggest that it is highly contagious, perhaps even more than Delta, though early reports suggest symptoms caused by this version of the new coronavirus may be less severe than in previous waves. Experts have cautioned that the true severity of Omicron infections isn’t yet known, since the first cases have been detected in younger people, who tend to have milder COVID-19 symptoms than those of adults and seniors.

“Vaccination and getting a booster when eligible, along with other preventive measures like masking and avoiding large crowds and poorly ventilated spaces, remain our most effective methods for fighting COVID-19,” Acting FDA Commissioner Janet Woodcock, MD, said in a news release. “As people gather indoors with family and friends for the holidays, we can’t let up on all the preventive public health measures that we have been taking during the pandemic. With both the Delta and Omicron variants continuing to spread, vaccination remains the best protection against COVID-19.”

In mid-November, the FDA authorized boosters of the Pfizer vaccine for all individuals 18 and older, but the agency held off on expanding the use of boosters for younger age groups, partly because they have the highest risk of myocarditis, a very rare side effect.

Myocarditis cases seem to be temporary, with patients making a full recovery, though they need to be monitored in the hospital. The risk of myocarditis with a COVID-19 infection is many times higher than it is from a vaccine.

There have been little data to support the need for boosters in this age group, because children and teens tend to experience milder COVID-19 disease, though they are still at risk for post–COVID-19 complications such as long COVID and a delayed reaction to the virus called Post Acute Sequelae of SARS-CoV2 Infection among Children, or PAS-C.

All that changed with the arrival of Omicron.

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

A raft of new studies that looked at the ability of Omicron to evade an array of currently available vaccines suggest a substantial loss of protection against the highly mutated variant.

Medscape Illustration/Dreamstime

The new studies, from teams of researchers in Germany, South Africa, Sweden, and the drug company Pfizer, showed 25 to 40-fold drops in the ability of antibodies created by two doses of the Pfizer-BioNTech vaccine to neutralize the virus.  

But there seemed to be a bright spot in the studies too. The virus didn’t completely escape the immunity from the vaccines, and giving a third, booster dose appeared to restore antibodies to a level that’s been associated with protection against variants in the past.

“One of the silver linings of this pandemic so far is that mRNA vaccines manufactured based on the ancestral SARS-CoV-2 continue to work in the laboratory and, importantly, in real life against variant strains,” said Hana El Sahly, MD, professor of molecular virology and microbiology at Baylor College of Medicine in Houston. “The strains so far vary by their degree of being neutralized by the antibodies from these vaccines, but they are being neutralized nonetheless.” 

Dr. El Sahly points out that the Beta variant was associated with a 10-fold drop in antibodies, but two doses of the vaccines still protected against it.

President Biden hailed the study results as good news.

“That Pfizer lab report came back saying that the expectation is that the existing vaccines protect against Omicron. But if you get the booster, you’re really in good shape. And so that’s very encouraging,” he said in a press briefing Dec. 8.
 

More research needed

Other scientists, however, stressed that these studies are from lab tests, and don’t necessarily reflect what will happen with Omicron in the real world. They cautioned about a worldwide push for boosters with so many countries still struggling to give first doses of vaccines.

Soumya Swaminathan, MD, chief scientist for the World Health Organization, stressed in a press briefing Dec. 8 that the results from the four studies varied widely, showing dips in neutralizing activity with Omicron that ranged from 5-fold to 40-fold.

The types of lab tests that were run were different, too, and involved small numbers of blood samples from patients.

She stressed that immunity depends not just on neutralizing antibodies, which act as a first line of defense when a virus invades, but also on B cells and T cells, and so far, tests show that these crucial components — which are important for preventing severe disease and death — had been less impacted than antibodies.

“So, I think it’s premature to conclude that this reduction in neutralizing activity would result in a significant reduction in vaccine effectiveness,” she said.

Whether or not these first-generation vaccines will be enough to stop Omicron, though, remains to be seen. A study of the Pfizer, Moderna, and AstraZeneca vaccines, led by German physician Sandra Ciesek, MD, who directs the Institute of Medical Virology at the University of Frankfurt, shows a booster didn’t appear to hold up well over time.

Dr. Ciesek and her team exposed Omicron viruses to the antibodies of volunteers who had been boosted with the Pfizer vaccine 3 months prior.  

She also compared the results to what happened to those same 3-month antibody levels against Delta variant viruses. She found only a 25% neutralization of Omicron compared with a 95% neutralization of Delta. That represented about a 37-fold reduction in the ability of the antibodies to neutralize Omicron vs Delta.

“The data confirm that developing a vaccine adapted for Omicron makes sense,” she tweeted as part of a long thread she posted on her results.
 

Retool the vaccines?

Both Pfizer and Moderna are retooling their vaccines to better match them to the changes in the Omicron variant. In a press release, Pfizer said it could start deliveries of that updated vaccine by March, pending U.S. Food and Drug Administration authorization.

“What the booster really does in neutralizing Omicron right now, they don’t know, they have no idea,” said Peter Palese, PhD, chair of the department of microbiology at the Mount Sinai School of Medicine in New York City.

Dr. Palese said he was definitely concerned about a possible Omicron wave.

“There are four major sites on the spike protein targeted by antibodies from the vaccines, and all four sites have mutations,” he said. “All these important antigenic sites are changed.

“If Omicron becomes the new Delta, and the old vaccines really aren’t good enough, then we have to make new Omicron vaccines. Then we have to revaccinate everybody twice,” he said, and the costs could be staggering. “I am worried.”

Tedros Adhanom Ghebreyesus, PhD, director general of the WHO, urged countries to move quickly.

“Don’t wait. Act now,” he said, even before all the science is in hand. “All of us, every government, every individual should use all the tools we have right now,” to drive down transmission, increase testing and surveillance, and share scientific findings.

“We can prevent Omicron [from] becoming a global crisis right now,” he said.

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

A raft of new studies that looked at the ability of Omicron to evade an array of currently available vaccines suggest a substantial loss of protection against the highly mutated variant.

Medscape Illustration/Dreamstime

The new studies, from teams of researchers in Germany, South Africa, Sweden, and the drug company Pfizer, showed 25 to 40-fold drops in the ability of antibodies created by two doses of the Pfizer-BioNTech vaccine to neutralize the virus.  

But there seemed to be a bright spot in the studies too. The virus didn’t completely escape the immunity from the vaccines, and giving a third, booster dose appeared to restore antibodies to a level that’s been associated with protection against variants in the past.

“One of the silver linings of this pandemic so far is that mRNA vaccines manufactured based on the ancestral SARS-CoV-2 continue to work in the laboratory and, importantly, in real life against variant strains,” said Hana El Sahly, MD, professor of molecular virology and microbiology at Baylor College of Medicine in Houston. “The strains so far vary by their degree of being neutralized by the antibodies from these vaccines, but they are being neutralized nonetheless.” 

Dr. El Sahly points out that the Beta variant was associated with a 10-fold drop in antibodies, but two doses of the vaccines still protected against it.

President Biden hailed the study results as good news.

“That Pfizer lab report came back saying that the expectation is that the existing vaccines protect against Omicron. But if you get the booster, you’re really in good shape. And so that’s very encouraging,” he said in a press briefing Dec. 8.
 

More research needed

Other scientists, however, stressed that these studies are from lab tests, and don’t necessarily reflect what will happen with Omicron in the real world. They cautioned about a worldwide push for boosters with so many countries still struggling to give first doses of vaccines.

Soumya Swaminathan, MD, chief scientist for the World Health Organization, stressed in a press briefing Dec. 8 that the results from the four studies varied widely, showing dips in neutralizing activity with Omicron that ranged from 5-fold to 40-fold.

The types of lab tests that were run were different, too, and involved small numbers of blood samples from patients.

She stressed that immunity depends not just on neutralizing antibodies, which act as a first line of defense when a virus invades, but also on B cells and T cells, and so far, tests show that these crucial components — which are important for preventing severe disease and death — had been less impacted than antibodies.

“So, I think it’s premature to conclude that this reduction in neutralizing activity would result in a significant reduction in vaccine effectiveness,” she said.

Whether or not these first-generation vaccines will be enough to stop Omicron, though, remains to be seen. A study of the Pfizer, Moderna, and AstraZeneca vaccines, led by German physician Sandra Ciesek, MD, who directs the Institute of Medical Virology at the University of Frankfurt, shows a booster didn’t appear to hold up well over time.

Dr. Ciesek and her team exposed Omicron viruses to the antibodies of volunteers who had been boosted with the Pfizer vaccine 3 months prior.  

She also compared the results to what happened to those same 3-month antibody levels against Delta variant viruses. She found only a 25% neutralization of Omicron compared with a 95% neutralization of Delta. That represented about a 37-fold reduction in the ability of the antibodies to neutralize Omicron vs Delta.

“The data confirm that developing a vaccine adapted for Omicron makes sense,” she tweeted as part of a long thread she posted on her results.
 

Retool the vaccines?

Both Pfizer and Moderna are retooling their vaccines to better match them to the changes in the Omicron variant. In a press release, Pfizer said it could start deliveries of that updated vaccine by March, pending U.S. Food and Drug Administration authorization.

“What the booster really does in neutralizing Omicron right now, they don’t know, they have no idea,” said Peter Palese, PhD, chair of the department of microbiology at the Mount Sinai School of Medicine in New York City.

Dr. Palese said he was definitely concerned about a possible Omicron wave.

“There are four major sites on the spike protein targeted by antibodies from the vaccines, and all four sites have mutations,” he said. “All these important antigenic sites are changed.

“If Omicron becomes the new Delta, and the old vaccines really aren’t good enough, then we have to make new Omicron vaccines. Then we have to revaccinate everybody twice,” he said, and the costs could be staggering. “I am worried.”

Tedros Adhanom Ghebreyesus, PhD, director general of the WHO, urged countries to move quickly.

“Don’t wait. Act now,” he said, even before all the science is in hand. “All of us, every government, every individual should use all the tools we have right now,” to drive down transmission, increase testing and surveillance, and share scientific findings.

“We can prevent Omicron [from] becoming a global crisis right now,” he said.

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

A raft of new studies that looked at the ability of Omicron to evade an array of currently available vaccines suggest a substantial loss of protection against the highly mutated variant.

Medscape Illustration/Dreamstime

The new studies, from teams of researchers in Germany, South Africa, Sweden, and the drug company Pfizer, showed 25 to 40-fold drops in the ability of antibodies created by two doses of the Pfizer-BioNTech vaccine to neutralize the virus.  

But there seemed to be a bright spot in the studies too. The virus didn’t completely escape the immunity from the vaccines, and giving a third, booster dose appeared to restore antibodies to a level that’s been associated with protection against variants in the past.

“One of the silver linings of this pandemic so far is that mRNA vaccines manufactured based on the ancestral SARS-CoV-2 continue to work in the laboratory and, importantly, in real life against variant strains,” said Hana El Sahly, MD, professor of molecular virology and microbiology at Baylor College of Medicine in Houston. “The strains so far vary by their degree of being neutralized by the antibodies from these vaccines, but they are being neutralized nonetheless.” 

Dr. El Sahly points out that the Beta variant was associated with a 10-fold drop in antibodies, but two doses of the vaccines still protected against it.

President Biden hailed the study results as good news.

“That Pfizer lab report came back saying that the expectation is that the existing vaccines protect against Omicron. But if you get the booster, you’re really in good shape. And so that’s very encouraging,” he said in a press briefing Dec. 8.
 

More research needed

Other scientists, however, stressed that these studies are from lab tests, and don’t necessarily reflect what will happen with Omicron in the real world. They cautioned about a worldwide push for boosters with so many countries still struggling to give first doses of vaccines.

Soumya Swaminathan, MD, chief scientist for the World Health Organization, stressed in a press briefing Dec. 8 that the results from the four studies varied widely, showing dips in neutralizing activity with Omicron that ranged from 5-fold to 40-fold.

The types of lab tests that were run were different, too, and involved small numbers of blood samples from patients.

She stressed that immunity depends not just on neutralizing antibodies, which act as a first line of defense when a virus invades, but also on B cells and T cells, and so far, tests show that these crucial components — which are important for preventing severe disease and death — had been less impacted than antibodies.

“So, I think it’s premature to conclude that this reduction in neutralizing activity would result in a significant reduction in vaccine effectiveness,” she said.

Whether or not these first-generation vaccines will be enough to stop Omicron, though, remains to be seen. A study of the Pfizer, Moderna, and AstraZeneca vaccines, led by German physician Sandra Ciesek, MD, who directs the Institute of Medical Virology at the University of Frankfurt, shows a booster didn’t appear to hold up well over time.

Dr. Ciesek and her team exposed Omicron viruses to the antibodies of volunteers who had been boosted with the Pfizer vaccine 3 months prior.  

She also compared the results to what happened to those same 3-month antibody levels against Delta variant viruses. She found only a 25% neutralization of Omicron compared with a 95% neutralization of Delta. That represented about a 37-fold reduction in the ability of the antibodies to neutralize Omicron vs Delta.

“The data confirm that developing a vaccine adapted for Omicron makes sense,” she tweeted as part of a long thread she posted on her results.
 

Retool the vaccines?

Both Pfizer and Moderna are retooling their vaccines to better match them to the changes in the Omicron variant. In a press release, Pfizer said it could start deliveries of that updated vaccine by March, pending U.S. Food and Drug Administration authorization.

“What the booster really does in neutralizing Omicron right now, they don’t know, they have no idea,” said Peter Palese, PhD, chair of the department of microbiology at the Mount Sinai School of Medicine in New York City.

Dr. Palese said he was definitely concerned about a possible Omicron wave.

“There are four major sites on the spike protein targeted by antibodies from the vaccines, and all four sites have mutations,” he said. “All these important antigenic sites are changed.

“If Omicron becomes the new Delta, and the old vaccines really aren’t good enough, then we have to make new Omicron vaccines. Then we have to revaccinate everybody twice,” he said, and the costs could be staggering. “I am worried.”

Tedros Adhanom Ghebreyesus, PhD, director general of the WHO, urged countries to move quickly.

“Don’t wait. Act now,” he said, even before all the science is in hand. “All of us, every government, every individual should use all the tools we have right now,” to drive down transmission, increase testing and surveillance, and share scientific findings.

“We can prevent Omicron [from] becoming a global crisis right now,” he said.

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

A second U.S. case of COVID-19 caused by the Omicron variant has been picked up by genetic testing in Minnesota.

The man, from Hennepin County, Minn., fell ill on Nov. 22 after attending the Anime NYC 2021 conference at the Javits Center in New York City a few days before.  He sought testing on Nov. 24.  His symptoms have resolved, according to a press release on the case from the Minnesota Department of Health.  The man was fully vaccinated, the department said.

He was advised to isolate from others, but it’s unclear if he had contact with anyone else before he learning he was infected.

“This news is concerning, but it is not a surprise,” said Governor Tim Walz in a news release. “We know that this virus is highly infectious and moves quickly throughout the world. Minnesotans know what to do to keep each other safe now — get the vaccine, get tested, wear a mask indoors, and get a booster. Together, we can fight this virus and help keep Minnesotans safe,”

The first case of COVID-19 caused by Omicron was detected Dec. 1 in California. That case was in a traveler who had recently returned from South Africa.

This breaking news story will be updated.

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

A second U.S. case of COVID-19 caused by the Omicron variant has been picked up by genetic testing in Minnesota.

The man, from Hennepin County, Minn., fell ill on Nov. 22 after attending the Anime NYC 2021 conference at the Javits Center in New York City a few days before.  He sought testing on Nov. 24.  His symptoms have resolved, according to a press release on the case from the Minnesota Department of Health.  The man was fully vaccinated, the department said.

He was advised to isolate from others, but it’s unclear if he had contact with anyone else before he learning he was infected.

“This news is concerning, but it is not a surprise,” said Governor Tim Walz in a news release. “We know that this virus is highly infectious and moves quickly throughout the world. Minnesotans know what to do to keep each other safe now — get the vaccine, get tested, wear a mask indoors, and get a booster. Together, we can fight this virus and help keep Minnesotans safe,”

The first case of COVID-19 caused by Omicron was detected Dec. 1 in California. That case was in a traveler who had recently returned from South Africa.

This breaking news story will be updated.

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

A second U.S. case of COVID-19 caused by the Omicron variant has been picked up by genetic testing in Minnesota.

The man, from Hennepin County, Minn., fell ill on Nov. 22 after attending the Anime NYC 2021 conference at the Javits Center in New York City a few days before.  He sought testing on Nov. 24.  His symptoms have resolved, according to a press release on the case from the Minnesota Department of Health.  The man was fully vaccinated, the department said.

He was advised to isolate from others, but it’s unclear if he had contact with anyone else before he learning he was infected.

“This news is concerning, but it is not a surprise,” said Governor Tim Walz in a news release. “We know that this virus is highly infectious and moves quickly throughout the world. Minnesotans know what to do to keep each other safe now — get the vaccine, get tested, wear a mask indoors, and get a booster. Together, we can fight this virus and help keep Minnesotans safe,”

The first case of COVID-19 caused by Omicron was detected Dec. 1 in California. That case was in a traveler who had recently returned from South Africa.

This breaking news story will be updated.

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

Private insurers will soon be required to reimburse people enrolled in their plans for the cost of at-home, rapid COVID-19 tests, and mask mandates will be extended for air, rail and bus travelers through at least mid-March.

The measures are part of a suite of new actions President Joe Biden is expected to announce later today, Dec. 2, in the wake of the arrival of the Omicron variant in the United States. The White House’s initiatives are designed to fight an expected winter surge of COVID-19 infections, according to sources familiar with the president’s plans.

At about $24 per package, rapid COVID-19 testing remains prohibitively expensive for many, even after a promise to bring the tests to Americans at a wholesale cost.

Other countries have rapid tests available for free or about $1 per test, and many experts say more frequent use of rapid tests could help stop transmission of COVID-19 virus.

About 150 million Americans would be eligible for reimbursement for rapid tests through their insurance plans.

In addition to those steps, international travelers flying into the United States will soon be required to show proof of a negative COVID-19 test within 24 hours of their departure, whether they are vaccinated or not.

In keeping with the six-part plan to fight COVID-19 the administration outlined in August, the president’s new plan is centered around vaccinations for all eligible Americans, including booster doses for the estimated 100 million adults who are now at least 6 months past their second doses of a Pfizer or Moderna vaccine or 2 months past a Johnson & Johnson shot.

Those plans, which relied on vaccine mandates for most workers, have been stymied by recent court rulings blocking implementation of those requirements.

As the issue makes its way through the courts, Biden is expected to call on companies to voluntarily implement vaccination requirements for their workers, which he says are helping to close vaccination gaps.

Biden is also expected to outline a new push to get booster shots to all adults, with an emphasis on reaching seniors, who are at greatest risk for hospitalization and death from COVID-19.

The president is scheduled to speak at 1:40 PM on Dec. 2 at the National Institutes of Health.

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

Private insurers will soon be required to reimburse people enrolled in their plans for the cost of at-home, rapid COVID-19 tests, and mask mandates will be extended for air, rail and bus travelers through at least mid-March.

The measures are part of a suite of new actions President Joe Biden is expected to announce later today, Dec. 2, in the wake of the arrival of the Omicron variant in the United States. The White House’s initiatives are designed to fight an expected winter surge of COVID-19 infections, according to sources familiar with the president’s plans.

At about $24 per package, rapid COVID-19 testing remains prohibitively expensive for many, even after a promise to bring the tests to Americans at a wholesale cost.

Other countries have rapid tests available for free or about $1 per test, and many experts say more frequent use of rapid tests could help stop transmission of COVID-19 virus.

About 150 million Americans would be eligible for reimbursement for rapid tests through their insurance plans.

In addition to those steps, international travelers flying into the United States will soon be required to show proof of a negative COVID-19 test within 24 hours of their departure, whether they are vaccinated or not.

In keeping with the six-part plan to fight COVID-19 the administration outlined in August, the president’s new plan is centered around vaccinations for all eligible Americans, including booster doses for the estimated 100 million adults who are now at least 6 months past their second doses of a Pfizer or Moderna vaccine or 2 months past a Johnson & Johnson shot.

Those plans, which relied on vaccine mandates for most workers, have been stymied by recent court rulings blocking implementation of those requirements.

As the issue makes its way through the courts, Biden is expected to call on companies to voluntarily implement vaccination requirements for their workers, which he says are helping to close vaccination gaps.

Biden is also expected to outline a new push to get booster shots to all adults, with an emphasis on reaching seniors, who are at greatest risk for hospitalization and death from COVID-19.

The president is scheduled to speak at 1:40 PM on Dec. 2 at the National Institutes of Health.

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

Private insurers will soon be required to reimburse people enrolled in their plans for the cost of at-home, rapid COVID-19 tests, and mask mandates will be extended for air, rail and bus travelers through at least mid-March.

The measures are part of a suite of new actions President Joe Biden is expected to announce later today, Dec. 2, in the wake of the arrival of the Omicron variant in the United States. The White House’s initiatives are designed to fight an expected winter surge of COVID-19 infections, according to sources familiar with the president’s plans.

At about $24 per package, rapid COVID-19 testing remains prohibitively expensive for many, even after a promise to bring the tests to Americans at a wholesale cost.

Other countries have rapid tests available for free or about $1 per test, and many experts say more frequent use of rapid tests could help stop transmission of COVID-19 virus.

About 150 million Americans would be eligible for reimbursement for rapid tests through their insurance plans.

In addition to those steps, international travelers flying into the United States will soon be required to show proof of a negative COVID-19 test within 24 hours of their departure, whether they are vaccinated or not.

In keeping with the six-part plan to fight COVID-19 the administration outlined in August, the president’s new plan is centered around vaccinations for all eligible Americans, including booster doses for the estimated 100 million adults who are now at least 6 months past their second doses of a Pfizer or Moderna vaccine or 2 months past a Johnson & Johnson shot.

Those plans, which relied on vaccine mandates for most workers, have been stymied by recent court rulings blocking implementation of those requirements.

As the issue makes its way through the courts, Biden is expected to call on companies to voluntarily implement vaccination requirements for their workers, which he says are helping to close vaccination gaps.

Biden is also expected to outline a new push to get booster shots to all adults, with an emphasis on reaching seniors, who are at greatest risk for hospitalization and death from COVID-19.

The president is scheduled to speak at 1:40 PM on Dec. 2 at the National Institutes of Health.

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

An antiviral pill from Merck may help some high-risk patients survive a COVID-19 infection or help them stay out of the hospital, even though the risks of taking the drug aren’t yet fully known, according to a panel of experts that advises the Food and Drug Administration on its regulatory decisions for these types of drugs.

The FDA’s Antimicrobial Drugs Advisory Committee narrowly voted to authorize the drug molnupiravir, voting 13 to 10 to support emergency use, which requires a medication to meet a lower standard of evidence than does full approval.

The FDA is not bound by the committee’s vote but typically follows its advice.

If authorized by the agency, molnupiravir would be the first antiviral agent available as a pill to treat COVID-19. Other therapies to treat the infection are available — monoclonal antibodies and the drug remdesivir — but they are given by infusion.

The United Kingdom has already authorized the use of Merck’s drug.

“This was clearly a difficult decision,” said committee member Michael Green, MD, a pediatric infectious disease expert at the University of Pittsburg School of Medicine.

Green said he voted yes, and that the drug’s ability to prevent deaths in the study weighed heavily on his decision. He said given uncertainties around the drug both the company and FDA should keep a close eye on patients taking the drug going forward.

“Should an alternative oral agent become available that had a better safety profile and equal or better efficacy profile, the agency might reconsider its authorization,” he said.

Others didn’t agree that the drug should be allowed onto the market.

“I voted no,” said Jennifer Le, PharmD, a professor of clinical pharmacy at the University of California. Dr. Le said the modest benefit of the medication didn’t outweigh all the potential safety issues. “I think I just need more efficacy and safety data,” she said.

Initial results from the first half of people enrolled in the clinical trial found the pill cut the risk of hospitalization or death by 50% in patients at higher risk of severe outcomes from COVID-19.

But later results, released just days before the meeting, showed that the drug’s effectiveness had dropped to about 30%.

In the updated analysis, 48 patients out of the 709 who were taking the drug were hospitalized or died within 29 days compared to 68 out of 699 who randomly got the placebo. There was one death in the group that got molnupiravir compared to nine in the placebo group. Nearly all those deaths occurred during the first phase of the study.

On Nov. 30 Merck explained that the drug’s efficacy appeared to fall, in part, because the placebo group had experienced fewer hospitalizations and deaths than expected during the second half of the study, making the drug look less beneficial by comparison.

The company said it wasn’t sure why patients in the placebo group had fared so much better in later trial enrollments.

“The efficacy of this product is not overwhelmingly good,” said committee member David Hardy, MD, an infectious disease expert at Charles Drew University School of Medicine in Los Angeles. “And I think that makes all of us a little uncomfortable about whether this is an advanced therapeutic because it’s an oral medication rather than an intravenous medication,” he said during the panel’s deliberations.

“I think we have to be very careful about how we’re going to allow people to use this,” Dr. Hardy said.

Many who voted for authorization thought use of the drug should be restricted to unvaccinated people who were at high risk of severe COVID-19 outcomes, the same population enrolled in the clinical trial. People in the trial were considered at higher risk if they were over age 60, had cancer, chronic kidney disease, chronic obstructive pulmonary disease, were obese, or had heart disease or diabetes.

There are some significant limitations of the study that may affect how the drug is used. Vaccinated people couldn’t enroll in the study, so it’s not known if the medication would have any benefit for them. Nearly two-thirds of the U.S. population is fully vaccinated. The study found no additional benefit of the medication compared to the placebo in people who had detectable antibodies, presumably from a prior infection.

Animal studies found that the drug — which kills the virus by forcing it to make errors as it copies its genetic material inside cells — could disrupt bone formation. For that reason, the manufacturer and the FDA agreed that it should not be used in anyone younger than age 18.

Animal studies also indicated that the drug could cause birth defects. For that reason, the company said the drug shouldn’t be given to women who are pregnant or breastfeeding and said doctors should make sure women of childbearing age aren’t pregnant before taking the medication.

Some members of the panel felt that pregnant women and their doctors should be given the choice of whether or not to use the drug, given that pregnant women are at high risk for severe COVID-19 outcomes and infused therapies may not be available in all settings.

Other members of the committee said they were uncomfortable authorizing the drug given its potential to mutate the virus.

The drug, which forces the virus to mutate as it copies its RNA, eventually causes the virus to make so many errors in its genetic material that it can no longer make more of itself and the immune system clears it out of the body.

But it takes a few days to work — the drug is designed to be taken for 5 consecutive days -- and studies of the viral loads of patients taking the drug show that through the first 2 days, viral loads remain detectable as these mutations occur.

Studies by the FDA show some of those mutations in the spike protein are the same ones that have helped the virus become more transmissible and escape the protection of vaccines.

So the question is whether someone taking the medication could develop a dangerous mutation and then infect someone else, sparking the spread of a new variant.

Nicholas Kartsonis, MD, a vice president at Merck, said that the company was still analyzing data.

“Even if the probability is very low — 1 in 10,000 or 1 in 100,000 -- that this drug would induce an escape mutant for which the vaccines we have would not cover, that would be catastrophic for the whole world, actually,” said committee member James Hildreth, MD, an immunologist and president of Meharry Medical College, Nashville. “Do you have sufficient data on the likelihood of that happening?” he asked Dr. Kartsonis of Merck.

“So we don’t,” Dr. Kartsonis said.

He said, in theory, the risk of mutation with molnupiravir is the same as seen with the use of vaccines or monoclonal antibody therapies. Dr. Hildreth wasn’t satisfied with that answer.

“With all respect, the mechanism of your drug is to drive [genetic mutations], so it’s not the same as the vaccine. It’s not the same as monoclonal antibodies,” he said.

Dr. Hildreth later said he didn’t feel comfortable voting for authorization given the uncertainties around escape mutants. He voted no.

“It was an easy vote for me,” he said.

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

An antiviral pill from Merck may help some high-risk patients survive a COVID-19 infection or help them stay out of the hospital, even though the risks of taking the drug aren’t yet fully known, according to a panel of experts that advises the Food and Drug Administration on its regulatory decisions for these types of drugs.

The FDA’s Antimicrobial Drugs Advisory Committee narrowly voted to authorize the drug molnupiravir, voting 13 to 10 to support emergency use, which requires a medication to meet a lower standard of evidence than does full approval.

The FDA is not bound by the committee’s vote but typically follows its advice.

If authorized by the agency, molnupiravir would be the first antiviral agent available as a pill to treat COVID-19. Other therapies to treat the infection are available — monoclonal antibodies and the drug remdesivir — but they are given by infusion.

The United Kingdom has already authorized the use of Merck’s drug.

“This was clearly a difficult decision,” said committee member Michael Green, MD, a pediatric infectious disease expert at the University of Pittsburg School of Medicine.

Green said he voted yes, and that the drug’s ability to prevent deaths in the study weighed heavily on his decision. He said given uncertainties around the drug both the company and FDA should keep a close eye on patients taking the drug going forward.

“Should an alternative oral agent become available that had a better safety profile and equal or better efficacy profile, the agency might reconsider its authorization,” he said.

Others didn’t agree that the drug should be allowed onto the market.

“I voted no,” said Jennifer Le, PharmD, a professor of clinical pharmacy at the University of California. Dr. Le said the modest benefit of the medication didn’t outweigh all the potential safety issues. “I think I just need more efficacy and safety data,” she said.

Initial results from the first half of people enrolled in the clinical trial found the pill cut the risk of hospitalization or death by 50% in patients at higher risk of severe outcomes from COVID-19.

But later results, released just days before the meeting, showed that the drug’s effectiveness had dropped to about 30%.

In the updated analysis, 48 patients out of the 709 who were taking the drug were hospitalized or died within 29 days compared to 68 out of 699 who randomly got the placebo. There was one death in the group that got molnupiravir compared to nine in the placebo group. Nearly all those deaths occurred during the first phase of the study.

On Nov. 30 Merck explained that the drug’s efficacy appeared to fall, in part, because the placebo group had experienced fewer hospitalizations and deaths than expected during the second half of the study, making the drug look less beneficial by comparison.

The company said it wasn’t sure why patients in the placebo group had fared so much better in later trial enrollments.

“The efficacy of this product is not overwhelmingly good,” said committee member David Hardy, MD, an infectious disease expert at Charles Drew University School of Medicine in Los Angeles. “And I think that makes all of us a little uncomfortable about whether this is an advanced therapeutic because it’s an oral medication rather than an intravenous medication,” he said during the panel’s deliberations.

“I think we have to be very careful about how we’re going to allow people to use this,” Dr. Hardy said.

Many who voted for authorization thought use of the drug should be restricted to unvaccinated people who were at high risk of severe COVID-19 outcomes, the same population enrolled in the clinical trial. People in the trial were considered at higher risk if they were over age 60, had cancer, chronic kidney disease, chronic obstructive pulmonary disease, were obese, or had heart disease or diabetes.

There are some significant limitations of the study that may affect how the drug is used. Vaccinated people couldn’t enroll in the study, so it’s not known if the medication would have any benefit for them. Nearly two-thirds of the U.S. population is fully vaccinated. The study found no additional benefit of the medication compared to the placebo in people who had detectable antibodies, presumably from a prior infection.

Animal studies found that the drug — which kills the virus by forcing it to make errors as it copies its genetic material inside cells — could disrupt bone formation. For that reason, the manufacturer and the FDA agreed that it should not be used in anyone younger than age 18.

Animal studies also indicated that the drug could cause birth defects. For that reason, the company said the drug shouldn’t be given to women who are pregnant or breastfeeding and said doctors should make sure women of childbearing age aren’t pregnant before taking the medication.

Some members of the panel felt that pregnant women and their doctors should be given the choice of whether or not to use the drug, given that pregnant women are at high risk for severe COVID-19 outcomes and infused therapies may not be available in all settings.

Other members of the committee said they were uncomfortable authorizing the drug given its potential to mutate the virus.

The drug, which forces the virus to mutate as it copies its RNA, eventually causes the virus to make so many errors in its genetic material that it can no longer make more of itself and the immune system clears it out of the body.

But it takes a few days to work — the drug is designed to be taken for 5 consecutive days -- and studies of the viral loads of patients taking the drug show that through the first 2 days, viral loads remain detectable as these mutations occur.

Studies by the FDA show some of those mutations in the spike protein are the same ones that have helped the virus become more transmissible and escape the protection of vaccines.

So the question is whether someone taking the medication could develop a dangerous mutation and then infect someone else, sparking the spread of a new variant.

Nicholas Kartsonis, MD, a vice president at Merck, said that the company was still analyzing data.

“Even if the probability is very low — 1 in 10,000 or 1 in 100,000 -- that this drug would induce an escape mutant for which the vaccines we have would not cover, that would be catastrophic for the whole world, actually,” said committee member James Hildreth, MD, an immunologist and president of Meharry Medical College, Nashville. “Do you have sufficient data on the likelihood of that happening?” he asked Dr. Kartsonis of Merck.

“So we don’t,” Dr. Kartsonis said.

He said, in theory, the risk of mutation with molnupiravir is the same as seen with the use of vaccines or monoclonal antibody therapies. Dr. Hildreth wasn’t satisfied with that answer.

“With all respect, the mechanism of your drug is to drive [genetic mutations], so it’s not the same as the vaccine. It’s not the same as monoclonal antibodies,” he said.

Dr. Hildreth later said he didn’t feel comfortable voting for authorization given the uncertainties around escape mutants. He voted no.

“It was an easy vote for me,” he said.

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

An antiviral pill from Merck may help some high-risk patients survive a COVID-19 infection or help them stay out of the hospital, even though the risks of taking the drug aren’t yet fully known, according to a panel of experts that advises the Food and Drug Administration on its regulatory decisions for these types of drugs.

The FDA’s Antimicrobial Drugs Advisory Committee narrowly voted to authorize the drug molnupiravir, voting 13 to 10 to support emergency use, which requires a medication to meet a lower standard of evidence than does full approval.

The FDA is not bound by the committee’s vote but typically follows its advice.

If authorized by the agency, molnupiravir would be the first antiviral agent available as a pill to treat COVID-19. Other therapies to treat the infection are available — monoclonal antibodies and the drug remdesivir — but they are given by infusion.

The United Kingdom has already authorized the use of Merck’s drug.

“This was clearly a difficult decision,” said committee member Michael Green, MD, a pediatric infectious disease expert at the University of Pittsburg School of Medicine.

Green said he voted yes, and that the drug’s ability to prevent deaths in the study weighed heavily on his decision. He said given uncertainties around the drug both the company and FDA should keep a close eye on patients taking the drug going forward.

“Should an alternative oral agent become available that had a better safety profile and equal or better efficacy profile, the agency might reconsider its authorization,” he said.

Others didn’t agree that the drug should be allowed onto the market.

“I voted no,” said Jennifer Le, PharmD, a professor of clinical pharmacy at the University of California. Dr. Le said the modest benefit of the medication didn’t outweigh all the potential safety issues. “I think I just need more efficacy and safety data,” she said.

Initial results from the first half of people enrolled in the clinical trial found the pill cut the risk of hospitalization or death by 50% in patients at higher risk of severe outcomes from COVID-19.

But later results, released just days before the meeting, showed that the drug’s effectiveness had dropped to about 30%.

In the updated analysis, 48 patients out of the 709 who were taking the drug were hospitalized or died within 29 days compared to 68 out of 699 who randomly got the placebo. There was one death in the group that got molnupiravir compared to nine in the placebo group. Nearly all those deaths occurred during the first phase of the study.

On Nov. 30 Merck explained that the drug’s efficacy appeared to fall, in part, because the placebo group had experienced fewer hospitalizations and deaths than expected during the second half of the study, making the drug look less beneficial by comparison.

The company said it wasn’t sure why patients in the placebo group had fared so much better in later trial enrollments.

“The efficacy of this product is not overwhelmingly good,” said committee member David Hardy, MD, an infectious disease expert at Charles Drew University School of Medicine in Los Angeles. “And I think that makes all of us a little uncomfortable about whether this is an advanced therapeutic because it’s an oral medication rather than an intravenous medication,” he said during the panel’s deliberations.

“I think we have to be very careful about how we’re going to allow people to use this,” Dr. Hardy said.

Many who voted for authorization thought use of the drug should be restricted to unvaccinated people who were at high risk of severe COVID-19 outcomes, the same population enrolled in the clinical trial. People in the trial were considered at higher risk if they were over age 60, had cancer, chronic kidney disease, chronic obstructive pulmonary disease, were obese, or had heart disease or diabetes.

There are some significant limitations of the study that may affect how the drug is used. Vaccinated people couldn’t enroll in the study, so it’s not known if the medication would have any benefit for them. Nearly two-thirds of the U.S. population is fully vaccinated. The study found no additional benefit of the medication compared to the placebo in people who had detectable antibodies, presumably from a prior infection.

Animal studies found that the drug — which kills the virus by forcing it to make errors as it copies its genetic material inside cells — could disrupt bone formation. For that reason, the manufacturer and the FDA agreed that it should not be used in anyone younger than age 18.

Animal studies also indicated that the drug could cause birth defects. For that reason, the company said the drug shouldn’t be given to women who are pregnant or breastfeeding and said doctors should make sure women of childbearing age aren’t pregnant before taking the medication.

Some members of the panel felt that pregnant women and their doctors should be given the choice of whether or not to use the drug, given that pregnant women are at high risk for severe COVID-19 outcomes and infused therapies may not be available in all settings.

Other members of the committee said they were uncomfortable authorizing the drug given its potential to mutate the virus.

The drug, which forces the virus to mutate as it copies its RNA, eventually causes the virus to make so many errors in its genetic material that it can no longer make more of itself and the immune system clears it out of the body.

But it takes a few days to work — the drug is designed to be taken for 5 consecutive days -- and studies of the viral loads of patients taking the drug show that through the first 2 days, viral loads remain detectable as these mutations occur.

Studies by the FDA show some of those mutations in the spike protein are the same ones that have helped the virus become more transmissible and escape the protection of vaccines.

So the question is whether someone taking the medication could develop a dangerous mutation and then infect someone else, sparking the spread of a new variant.

Nicholas Kartsonis, MD, a vice president at Merck, said that the company was still analyzing data.

“Even if the probability is very low — 1 in 10,000 or 1 in 100,000 -- that this drug would induce an escape mutant for which the vaccines we have would not cover, that would be catastrophic for the whole world, actually,” said committee member James Hildreth, MD, an immunologist and president of Meharry Medical College, Nashville. “Do you have sufficient data on the likelihood of that happening?” he asked Dr. Kartsonis of Merck.

“So we don’t,” Dr. Kartsonis said.

He said, in theory, the risk of mutation with molnupiravir is the same as seen with the use of vaccines or monoclonal antibody therapies. Dr. Hildreth wasn’t satisfied with that answer.

“With all respect, the mechanism of your drug is to drive [genetic mutations], so it’s not the same as the vaccine. It’s not the same as monoclonal antibodies,” he said.

Dr. Hildreth later said he didn’t feel comfortable voting for authorization given the uncertainties around escape mutants. He voted no.

“It was an easy vote for me,” he said.

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

Merck’s antiviral pill for COVID-19, molnupiravir, appears to be far less effective than early results from the clinical trial first suggested.

According to an analysis by scientists at the Food and Drug Administration, the experimental pill cut the risk of hospitalization or death from COVID-19 by about 30%, compared to a placebo, and the pill showed no benefit for people with antibodies against COVID-19 from prior infection.

The updated analysis showed 48 hospitalizations or deaths among study participants who were randomly assigned to take the antiviral drug, compared to 68 among those who took a placebo.

Those results come from the full set of 1,433 patients who were randomized in the clinical trial, which just became available last week.

Initial results from the first 775 patients enrolled in the clinical trial, which were issued in a company news release in October, had said the drug cut the risk of hospitalization or death for patients at high risk of severe disease by about 50%.

Merck has been producing millions of doses of molnupiravir, which is the first antiviral pill to treat COVID-19 infections. The United Kingdom’s drug regulator authorized use of the medication in early November. The company said it expected to distribute the medication globally by the end of 2021.

In October, two Indian drug companies halted late-stage clinical trials of a generic version of molnupiravir after the studies failed to find any benefit to patients with moderate COVID-19. Trials in patients with milder symptoms are still ongoing.

On Nov. 27, the New England Journal of Medicine postponed its planned early release of the molnupiravir study results, citing “new information.”

The medication is designed to be given as four pills taken every 12 hours for 5 days. It’s most effective when taken within the first few days of new symptoms, something that requires convenient and affordable testing.

The new results seem to put molnupiravir far below the effectiveness of existing treatments.

The infused monoclonal antibody cocktail REGEN-COV, which the FDA has already authorized for emergency use, is about 85% effective at preventing hospitalization or death in patients who are at risk for severe COVID-19 outcomes, and it appears to be just as effective in people who already have antibodies against COVID-19, which is why it is being given to both vaccinated and unvaccinated patients, the FDA said.

In early November, Pfizer said its experimental antiviral pill Paxlovid cut the risk of hospitalization or death by 89%.

In briefing documents posted ahead of an advisory committee meeting Nov. 30, the FDA highlights other potential safety issues with the Merck drug, which works by causing the virus to make mistakes as it copies itself, eventually causing the virus to mutate itself to death.

The agency has asked the advisory committee to weigh in on the right patient population for the drug: Should pregnant women get it? Could the drug harm a developing fetus?

Should vaccinated people with breakthrough infections get it? Would it work for them? People with reduced immune function are more likely to get a breakthrough infection. They’re also more likely to shed virus for a longer period of time, making them perfect incubators for variants. What could happen if we give this type of patient a drug that increases mutations?

And what about mutations caused by the medication? Could they increase the potential for more variants? The agency concluded the risk of this happening was low.

In animal studies, the drug impacted bone formation. For this reason, the agency has agreed with the drug company that molnupiravir should not be given to anyone under the age of 18.

Aside from these concerns, the FDA says there were no major safety issues among people who took part in the clinical trial, though they acknowledge that number is small.

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

Merck’s antiviral pill for COVID-19, molnupiravir, appears to be far less effective than early results from the clinical trial first suggested.

According to an analysis by scientists at the Food and Drug Administration, the experimental pill cut the risk of hospitalization or death from COVID-19 by about 30%, compared to a placebo, and the pill showed no benefit for people with antibodies against COVID-19 from prior infection.

The updated analysis showed 48 hospitalizations or deaths among study participants who were randomly assigned to take the antiviral drug, compared to 68 among those who took a placebo.

Those results come from the full set of 1,433 patients who were randomized in the clinical trial, which just became available last week.

Initial results from the first 775 patients enrolled in the clinical trial, which were issued in a company news release in October, had said the drug cut the risk of hospitalization or death for patients at high risk of severe disease by about 50%.

Merck has been producing millions of doses of molnupiravir, which is the first antiviral pill to treat COVID-19 infections. The United Kingdom’s drug regulator authorized use of the medication in early November. The company said it expected to distribute the medication globally by the end of 2021.

In October, two Indian drug companies halted late-stage clinical trials of a generic version of molnupiravir after the studies failed to find any benefit to patients with moderate COVID-19. Trials in patients with milder symptoms are still ongoing.

On Nov. 27, the New England Journal of Medicine postponed its planned early release of the molnupiravir study results, citing “new information.”

The medication is designed to be given as four pills taken every 12 hours for 5 days. It’s most effective when taken within the first few days of new symptoms, something that requires convenient and affordable testing.

The new results seem to put molnupiravir far below the effectiveness of existing treatments.

The infused monoclonal antibody cocktail REGEN-COV, which the FDA has already authorized for emergency use, is about 85% effective at preventing hospitalization or death in patients who are at risk for severe COVID-19 outcomes, and it appears to be just as effective in people who already have antibodies against COVID-19, which is why it is being given to both vaccinated and unvaccinated patients, the FDA said.

In early November, Pfizer said its experimental antiviral pill Paxlovid cut the risk of hospitalization or death by 89%.

In briefing documents posted ahead of an advisory committee meeting Nov. 30, the FDA highlights other potential safety issues with the Merck drug, which works by causing the virus to make mistakes as it copies itself, eventually causing the virus to mutate itself to death.

The agency has asked the advisory committee to weigh in on the right patient population for the drug: Should pregnant women get it? Could the drug harm a developing fetus?

Should vaccinated people with breakthrough infections get it? Would it work for them? People with reduced immune function are more likely to get a breakthrough infection. They’re also more likely to shed virus for a longer period of time, making them perfect incubators for variants. What could happen if we give this type of patient a drug that increases mutations?

And what about mutations caused by the medication? Could they increase the potential for more variants? The agency concluded the risk of this happening was low.

In animal studies, the drug impacted bone formation. For this reason, the agency has agreed with the drug company that molnupiravir should not be given to anyone under the age of 18.

Aside from these concerns, the FDA says there were no major safety issues among people who took part in the clinical trial, though they acknowledge that number is small.

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

Merck’s antiviral pill for COVID-19, molnupiravir, appears to be far less effective than early results from the clinical trial first suggested.

According to an analysis by scientists at the Food and Drug Administration, the experimental pill cut the risk of hospitalization or death from COVID-19 by about 30%, compared to a placebo, and the pill showed no benefit for people with antibodies against COVID-19 from prior infection.

The updated analysis showed 48 hospitalizations or deaths among study participants who were randomly assigned to take the antiviral drug, compared to 68 among those who took a placebo.

Those results come from the full set of 1,433 patients who were randomized in the clinical trial, which just became available last week.

Initial results from the first 775 patients enrolled in the clinical trial, which were issued in a company news release in October, had said the drug cut the risk of hospitalization or death for patients at high risk of severe disease by about 50%.

Merck has been producing millions of doses of molnupiravir, which is the first antiviral pill to treat COVID-19 infections. The United Kingdom’s drug regulator authorized use of the medication in early November. The company said it expected to distribute the medication globally by the end of 2021.

In October, two Indian drug companies halted late-stage clinical trials of a generic version of molnupiravir after the studies failed to find any benefit to patients with moderate COVID-19. Trials in patients with milder symptoms are still ongoing.

On Nov. 27, the New England Journal of Medicine postponed its planned early release of the molnupiravir study results, citing “new information.”

The medication is designed to be given as four pills taken every 12 hours for 5 days. It’s most effective when taken within the first few days of new symptoms, something that requires convenient and affordable testing.

The new results seem to put molnupiravir far below the effectiveness of existing treatments.

The infused monoclonal antibody cocktail REGEN-COV, which the FDA has already authorized for emergency use, is about 85% effective at preventing hospitalization or death in patients who are at risk for severe COVID-19 outcomes, and it appears to be just as effective in people who already have antibodies against COVID-19, which is why it is being given to both vaccinated and unvaccinated patients, the FDA said.

In early November, Pfizer said its experimental antiviral pill Paxlovid cut the risk of hospitalization or death by 89%.

In briefing documents posted ahead of an advisory committee meeting Nov. 30, the FDA highlights other potential safety issues with the Merck drug, which works by causing the virus to make mistakes as it copies itself, eventually causing the virus to mutate itself to death.

The agency has asked the advisory committee to weigh in on the right patient population for the drug: Should pregnant women get it? Could the drug harm a developing fetus?

Should vaccinated people with breakthrough infections get it? Would it work for them? People with reduced immune function are more likely to get a breakthrough infection. They’re also more likely to shed virus for a longer period of time, making them perfect incubators for variants. What could happen if we give this type of patient a drug that increases mutations?

And what about mutations caused by the medication? Could they increase the potential for more variants? The agency concluded the risk of this happening was low.

In animal studies, the drug impacted bone formation. For this reason, the agency has agreed with the drug company that molnupiravir should not be given to anyone under the age of 18.

Aside from these concerns, the FDA says there were no major safety issues among people who took part in the clinical trial, though they acknowledge that number is small.

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

Everyone over the age of 18 should be allowed to receive a booster of their COVID-19 vaccines, according to a panel of experts that advises CDC on its vaccine recommendations.

The Advisory Committee on Immunization Practices, or ACIP, recommended that all adults be eligible for a third dose of a Pfizer or Moderna mRNA vaccine, at least 6 months after their second dose.

They also strengthened a recommendation that everyone over the age of 50 should get a third dose, whether or not they have an underlying health condition that may increase their risk from a COVID-19 infection.

The committee voted 11 to 0 in favor of both policies.

CDC Director Rochelle Walensky, MD, must now sign off on both policies, which she is expected to do.

More than 70 million adults are now eligible for booster shots in the United States, but only about 31 million people have received one.  About half of those who have been boosted are over the age of 65.

In a recent survey, the Kaiser Family Foundation found that about 4 in 10 younger adults said they were unsure if they qualified for a booster.

Under the current policy, boosters are recommended for everyone age 65 and older.  But people who are younger than age 65 are eligible for boosters if they have an underlying health condition or live or work in a high-risk situation—something individuals have to determine on their own.  Experts said that shading of the policy had created confusion that was holding people back.

Nirav Shah, MD, JD, president of the Association of State and Territorial Health Officials, noted that public health officials have been swamped with calls from people who are trying to figure out if they are eligible to get a booster dose.

He said that in a call the evening of Nov. 18 with state health departments, “There was not a single state that voiced opposition to this move,” he told the ACIP.

Dr. Shah said that the current guidelines were well intentioned, but “in pursuit of precision, they create confusion.”

“Our concern is that eligible individuals are not receiving boosters right now as a result of this confusion,” he said.

The committee based its decision on the results of a new study of boosters in Pfizer vaccine recipients, as well as reassuring safety information that’s being collected through the CDC and FDA’s monitoring systems.

Pfizer presented the early results from a study of 10,000 people who had all received two doses of its vaccine.   Half of the study participants received a third shot, or booster. The other half got a placebo.

The study is ongoing, but so far, six of the people in the booster group have gotten a COVID-19 infection with symptoms compared to 123 people who got COVID-19 in the placebo group, making boosters 95% effective at keeping people from getting sick.  Most people in the study had gotten their original doses about 10 months earlier. They’ve been followed for about 10 weeks since their booster.  Importantly, there were no study participants hospitalized for COVID-19 infections in either the placebo or booster group, indicating that the first two doses were still very effective at preventing severe outcomes from infection.

The majority of side effects after a third Pfizer dose were mild and temporary.  Side effects like sore arms, swelling, fever, headache, and fatigue were more common in the booster group — affecting about 1 in 4 people who got a third shot.  Vaccination side effects were less common after boosters than have been seen after the second dose of the vaccine.

Some cases of myocarditis and pericarditis have been reported after people received vaccine boosters, but the risk for this heart inflammation appears to be extremely low, about two cases for every million doses given.  There were 54 cases of myocarditis reported so far to the Vaccine Adverse Event Reporting System, or VAERS.  So far, only 12 have met the case definition and are considered related to vaccination.  Most of the reported cases are still being studied.

Everyone over the age of 18 should be allowed to receive a booster of their COVID-19 vaccines, according to a panel of experts that advises CDC on its vaccine recommendations.

The Advisory Committee on Immunization Practices, or ACIP, recommended that all adults be eligible for a third dose of a Pfizer or Moderna mRNA vaccine, at least 6 months after their second dose.

They also strengthened a recommendation that everyone over the age of 50 should get a third dose, whether or not they have an underlying health condition that may increase their risk from a COVID-19 infection.

The committee voted 11 to 0 in favor of both policies.

CDC Director Rochelle Walensky, MD, must now sign off on both policies, which she is expected to do.

More than 70 million adults are now eligible for booster shots in the United States, but only about 31 million people have received one.  About half of those who have been boosted are over the age of 65.

In a recent survey, the Kaiser Family Foundation found that about 4 in 10 younger adults said they were unsure if they qualified for a booster.

Under the current policy, boosters are recommended for everyone age 65 and older.  But people who are younger than age 65 are eligible for boosters if they have an underlying health condition or live or work in a high-risk situation—something individuals have to determine on their own.  Experts said that shading of the policy had created confusion that was holding people back.

Nirav Shah, MD, JD, president of the Association of State and Territorial Health Officials, noted that public health officials have been swamped with calls from people who are trying to figure out if they are eligible to get a booster dose.

He said that in a call the evening of Nov. 18 with state health departments, “There was not a single state that voiced opposition to this move,” he told the ACIP.

Dr. Shah said that the current guidelines were well intentioned, but “in pursuit of precision, they create confusion.”

“Our concern is that eligible individuals are not receiving boosters right now as a result of this confusion,” he said.

The committee based its decision on the results of a new study of boosters in Pfizer vaccine recipients, as well as reassuring safety information that’s being collected through the CDC and FDA’s monitoring systems.

Pfizer presented the early results from a study of 10,000 people who had all received two doses of its vaccine.   Half of the study participants received a third shot, or booster. The other half got a placebo.

The study is ongoing, but so far, six of the people in the booster group have gotten a COVID-19 infection with symptoms compared to 123 people who got COVID-19 in the placebo group, making boosters 95% effective at keeping people from getting sick.  Most people in the study had gotten their original doses about 10 months earlier. They’ve been followed for about 10 weeks since their booster.  Importantly, there were no study participants hospitalized for COVID-19 infections in either the placebo or booster group, indicating that the first two doses were still very effective at preventing severe outcomes from infection.

The majority of side effects after a third Pfizer dose were mild and temporary.  Side effects like sore arms, swelling, fever, headache, and fatigue were more common in the booster group — affecting about 1 in 4 people who got a third shot.  Vaccination side effects were less common after boosters than have been seen after the second dose of the vaccine.

Some cases of myocarditis and pericarditis have been reported after people received vaccine boosters, but the risk for this heart inflammation appears to be extremely low, about two cases for every million doses given.  There were 54 cases of myocarditis reported so far to the Vaccine Adverse Event Reporting System, or VAERS.  So far, only 12 have met the case definition and are considered related to vaccination.  Most of the reported cases are still being studied.

Everyone over the age of 18 should be allowed to receive a booster of their COVID-19 vaccines, according to a panel of experts that advises CDC on its vaccine recommendations.

The Advisory Committee on Immunization Practices, or ACIP, recommended that all adults be eligible for a third dose of a Pfizer or Moderna mRNA vaccine, at least 6 months after their second dose.

They also strengthened a recommendation that everyone over the age of 50 should get a third dose, whether or not they have an underlying health condition that may increase their risk from a COVID-19 infection.

The committee voted 11 to 0 in favor of both policies.

CDC Director Rochelle Walensky, MD, must now sign off on both policies, which she is expected to do.

More than 70 million adults are now eligible for booster shots in the United States, but only about 31 million people have received one.  About half of those who have been boosted are over the age of 65.

In a recent survey, the Kaiser Family Foundation found that about 4 in 10 younger adults said they were unsure if they qualified for a booster.

Under the current policy, boosters are recommended for everyone age 65 and older.  But people who are younger than age 65 are eligible for boosters if they have an underlying health condition or live or work in a high-risk situation—something individuals have to determine on their own.  Experts said that shading of the policy had created confusion that was holding people back.

Nirav Shah, MD, JD, president of the Association of State and Territorial Health Officials, noted that public health officials have been swamped with calls from people who are trying to figure out if they are eligible to get a booster dose.

He said that in a call the evening of Nov. 18 with state health departments, “There was not a single state that voiced opposition to this move,” he told the ACIP.

Dr. Shah said that the current guidelines were well intentioned, but “in pursuit of precision, they create confusion.”

“Our concern is that eligible individuals are not receiving boosters right now as a result of this confusion,” he said.

The committee based its decision on the results of a new study of boosters in Pfizer vaccine recipients, as well as reassuring safety information that’s being collected through the CDC and FDA’s monitoring systems.

Pfizer presented the early results from a study of 10,000 people who had all received two doses of its vaccine.   Half of the study participants received a third shot, or booster. The other half got a placebo.

The study is ongoing, but so far, six of the people in the booster group have gotten a COVID-19 infection with symptoms compared to 123 people who got COVID-19 in the placebo group, making boosters 95% effective at keeping people from getting sick.  Most people in the study had gotten their original doses about 10 months earlier. They’ve been followed for about 10 weeks since their booster.  Importantly, there were no study participants hospitalized for COVID-19 infections in either the placebo or booster group, indicating that the first two doses were still very effective at preventing severe outcomes from infection.

The majority of side effects after a third Pfizer dose were mild and temporary.  Side effects like sore arms, swelling, fever, headache, and fatigue were more common in the booster group — affecting about 1 in 4 people who got a third shot.  Vaccination side effects were less common after boosters than have been seen after the second dose of the vaccine.

Some cases of myocarditis and pericarditis have been reported after people received vaccine boosters, but the risk for this heart inflammation appears to be extremely low, about two cases for every million doses given.  There were 54 cases of myocarditis reported so far to the Vaccine Adverse Event Reporting System, or VAERS.  So far, only 12 have met the case definition and are considered related to vaccination.  Most of the reported cases are still being studied.