More U.S. adults could be eligible for a booster dose of the COVID-19 vaccine if a panel of experts meets as planned on Friday and recommends that a third round of the shots would be beneficial for a broad population.
While over 31 million Americans have already received a booster shot, current federal guidelines only recommend extra doses for some population groups.
Pfizer Inc and BioNTech SE asked the U.S. Food and Drug Administration weeks ago to authorize boosters for all adults, and Moderna Inc applied for that same group this week.
The FDA has not yet made an authorization but is expected to do so in order to clear the way for a recommendation by an advisory committee to the Centers for U.S. Disease Control and Prevention (CDC) scheduled to meet at noon Friday on boosters.
Politico reported late Thursday that the FDA is prepared to endorse both on Friday.
The CDC meeting would be followed by a recommendation from the agency's director, who has publicly supported boosters for all.
A broad recommendation could bring uniformity in the country at a time when individual states such as Colorado, California and Massachusetts have already made all adults eligible for COVID-19 vaccine boosters.
"The messaging has become muddled," Dr. Leana Wen, an emergency physician and public health professor at George Washington University, said in a post on Twitter.
Pfizer previously requested authorization for all people aged 16 or over, but U.S. health advisers held back on extending boosters to everyone, partly because there was not enough evidence of waning immunity or the need in younger people.
Some of the CDC's outside advisers had raised concerns that booster doses are not needed in young, healthy individuals for whom the initial vaccination provides sufficient protection from serious disease and death.
Pfizer has since reported data from a large clinical study that showed a booster dose of its vaccine was 95.6% effective against the coronavirus when compared with a vaccinated group that did not get the third shot.
Israeli data has also showed that administering Pfizer/BioNTech booster shots widely slowed virus transmission.
Moderna does not have similar data to provide, but the vaccines are both based on messenger RNA and work in the same way.
Top U.S. infectious disease doctor Anthony Fauci said earlier this week that boosters can prevent infection as colder weather and indoor gatherings lead to a rise in cases.
There has been "a ground swell of interest in boosters-for-all," said Dr. William Schaffner, a leading infectious disease expert from the Vanderbilt University School of Medicine who serves as the liaison for the National Foundation for Infectious Diseases.
While the panel could be split, Schaffner said, he believes it is likely they will vote in favor of extending booster eligibility.
Based on research showing vaccine-generated antibody levels dip after several months, the panel is likely to recommend boosters for a broad population, said Dr. Robert Klugman at UMass Memorial Health Care in Massachusetts.
Booster doses of messenger RNA (mRNA) vaccines from Pfizer/BioNTech or Moderna are currently available for people who are immunocompromised, those who are aged 65 and above, and for individuals at high-risk of severe disease or who are regularly exposed to the virus through work or living conditions.
Anecdotal reports suggest that Americans have been largely able to get boosters, whether or not they are eligible.
"There is a lot of boosting going on that does not conform to the current, somewhat more restrictive set of recommendations," said Schaffner.
Nearly 60% of adult Americans - some 195.6 million people - are considered fully vaccinated, having received two doses of either the Pfizer/BioNTech or Moderna vaccines, or one shot of the Johnson & Johnson vaccine.
© 2022 Thomson/Reuters. All rights reserved.