The FDA's decision opens a fourth dose of the Pfizer or Moderna vaccines to that age group at least four months after their previous booster.
WASHINGTON -- U.S. regulators on Tuesday authorized another COVID-19 booster for people age 50 and older, a step to offer extra protection for the most vulnerable in case the coronavirus rebounds.
Everyone eligible for a first booster who hasn't gotten one yet needs to, FDA vaccine chief Dr. Peter Marks said. But the second booster is only for these higher-risk groups because"current evidence suggests some waning of protection" for them. There's limited evidence to tell how much benefit another booster could offer right now. FDA made the decision without input from its independent panel of experts that has wrestled with how much data is required to expand shots.
During the U.S. omicron wave, two doses were nearly 80% effective against needing a ventilator or death - and a booster pushed that protection to 94%, the CDC recently reported. Vaccine effectiveness was lowest - 74% - in immune-compromised people, the vast majority of whom hadn't gotten a third dose.
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