The Food and Drug Administration (FDA) gave the green light on Tuesday, March 29 to a second coronavirus vaccine booster shot for people aged 50 and older in an effort to ward off another potential spike in infections due to a subvariant of omicron.

The agency granted emergency use authorization to the vaccines from Pfizer as well as Moderna. Pfizer had initially requested authorization for people aged 65 and older, while Moderna requested broader authorization for all adults.

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