The F.D.A. authorizes Pfizer-BioNTech boosters for children ages 5 to 11.
More than eight million of the 28 million children in that age group in the United States have received two vaccine shots.
![The F.D.A. authorizes Pfizer-BioNTech boosters for children ages 5 to 11.](https://static01.nyt.com/images/2022/05/17/world/17virus-briefing-fda-pfizer1/merlin_197274552_b9493f17-f75d-4047-bee9-cab6a523c524-facebookJumbo.jpg)
More than eight million of the 28 million children in that age group in the United States have received two vaccine shots.