The F.D.A. authorizes Moderna and J.&J. boosters and allows a mix-and-match booster strategy.
Briefly

WASHINGTON - The Food and Drug Administration on Wednesday authorized booster shots for tens of millions of recipients of Moderna's two-dose coronavirus vaccine and the roughly 15 million who got Johnson & Johnson's single-dose shot, significantly expanding the nation's campaign to bolster protection for vulnerable people.
Read at Nytimes
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