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FDA strikes cautious tone ahead of vaccine booster meeting
AP Sep 15, 2021 1 day ago
FILE - In this Aug. 26, 2021 file photo, Parsia Jahanbani prepares a syringe with the Pfizer COVID-19 vaccine in a mobile vaccine clinic operated by Families Together of Orange County in Santa Ana, Calif. An international group of scientists is arguing the average person doesn't need a COVID-19 booster yet — an opinion that highlights the intense scientific divide over the question. (AP Photo/Jae C. Hong, File)
A syringe is prepared with the Pfizer COVID-19 vaccine at a clinic at the Reading Area Community College in Reading, Pa., Tuesday, Sept. 14, 2021. (AP Photo/Matt Rourke)
WASHINGTON (AP) — Influential government advisers will debate Friday if there's enough proof that a booster dose of Pfizer's COVID-19 vaccine is safe and effective — the first step toward deciding which Americans need one and when.
Pfizer’s argument: While protection against severe disease is holding strong in the U.S., immunity against milder infection wanes somewhere around six to eight months after the second dose. The company gave an extra dose to 306 people at that point and recorded levels of virus-fighting antibodies threefold higher than after the earlier shots.
More important, Pfizer said, those antibodies appear strong enough to handle the extra-contagious delta variant that is surging around the country.
To bolster its case, Pfizer pointed the FDA to data from Israel, which began offering boosters over the summer.
That study tracked about 1 million people 60 and older and found those who got the extra shot were far less likely to become infected soon afterward. Pfizer said that translates to “roughly 95% effectiveness” when delta was spreading, comparable to the protection seen shortly after the vaccine’s rollout earlier in the year.
The Israeli data, also published Wednesday in the New England Journal of Medicine, cannot say how long the boosted protection lasts.
The FDA's reviewers, however, suggested they would mainly look to research on how the vaccines are working among Americans, saying that “may most accurately represent vaccine effectiveness in the U.S. population.”
Overall, the data show that the Pfizer and other U.S.-authorized COVID-19 vaccines “still afford protection against severe COVID-19 disease and death in the United States,” the agency said, summarizing the evidence.
Dr. Anna Durbin of Johns Hopkins School of Public Health said it’s important to understand the FDA’s decision simply is whether an extra dose is safe and does what it promises — to raise immunity levels.
If the FDA decides the extra shot does those two things, then the Centers for Disease Control and Prevention will have to decide who should get another dose. The CDC has scheduled a meeting of its own advisers for next week and has signaled it is considering a booster for certain people — such as older adults, nursing home residents and front-line health workers — rather than the general population.
The U.S. already offers an extra dose of the Pfizer or Moderna vaccines to people with severely weakened immune systems.
For the average person, what’s the evidence that immunity is waning? The CDC says real-world data show protection against severe illness, hospitalizations and deaths is holding strong. But in one recent study, protection against infection slipped as the delta variant hit: It was 91% in the spring but 78% in June and July. The CDC also has seen a hint that for people 75 and older, protection against hospitalizations slightly declined in the summer.
Moderna also has asked FDA to allow a booster dose of its vaccine, and on Wednesday posted its own study of waning immunity.
Researchers compared about 14,000 people in Moderna’s 2020 vaccine study who had gotten a first dose about a year ago with another 11,000 vaccinated last winter, roughly eight months ago. As delta surged in July and August, Moderna concluded the more recently vaccinated group had a 36% lower rate of “breakthrough” infections compared with those vaccinated longer ago.
It's not clear how soon FDA will consider a Moderna booster, or one for people who received the single-shot Johnson & Johnson vaccine.
The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute’s Department of Science Education. The AP is solely responsible for all content.
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