A health worker draws a dose of Pfizer-BioNTech COVID-19 vaccine in Miami, Fla., on Aug. 5, 2021. Marco Bello/Reuters
U.S. drug regulators on Thursday authorized booster doses of Pfizer’s COVID-19 vaccine for 16- and 17-year-olds.
The Food and Drug Administration (FDA) cited in its announcement data showing the vaccine becomes significantly less effective over time.
