Fauci said on Sunday that in three to four weeks -- as more data from Israel and the U.S. emerge -- the FDA advisory panel will continue to reexamine and modify recommendations for boosters.

More than 36.6 million U.S. adults had gotten their booster shot as of Nov. 23, or about 19 percent of the nation’s fully vaccinated population, according to CDC data.

U.S. scientists and regulators told Pfizer July 12 that they need more data and more time to determine if COVID-19 vaccine booster shots are necessary, The New York Times reported.

NPR's Rachel Martin talks to Anthony Fauci, the nation's top infectious disease doctor and the president's chief medical adviser, about the science and decision-making concerning booster shots.

Dr. Anthony Fauci said Moderna and Pfizer vaccine boosters are likely to provide substantial protection against the Omicron variant. "Our booster vaccine regimens work against Omicron. At this ...