F.D.A. Authorizes Pfizer Boosters for 16- and 17-Year-Olds

The move clears the way for millions of teenagers to receive an additional shot, with a top regulator citing evidence that the effectiveness of two doses is waning in the age group.,The move clears the way for millions of teenagers to receive an additional shot, with a top regulator citing evidence that the effectiveness of two doses is waning in the age group.

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