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The US Food and Drug Administration authorized booster doses of Covid-19 vaccines made by Moderna and Johnson & Johnson Wednesday and also said any of the three authorized vaccines could be used as a booster in a "mix and match" approach.
But it left in place a complex formula for who should get get boosters and when, with officials saying they may simplify the framework as more safety data comes in.
Now vaccine advisers to the US Centers for Disease Control and Prevention will consider the FDA's authorization, and offer their own advice. If CDC director Dr. Rochelle Walensky signs off, people could start getting Moderna and J&J boosters within days.
The FDA gave emergency use authorization for a half dose of Moderna's vaccine as a booster for people fully vaccinated at least six months ago who are also at least 65, or who are at least 18 and at high risk of severe Covid-19 or have frequent institutional or occupational exposure to SARS-CoV-2.
It also authorized booster doses of Johnson & Johnson's vaccine for anyone who got that vaccine, so those 18 and older, at least two months ago.
