Younger adolescents get ready to receive COVID-19 vaccine

Nawaf Albarakati, 17, of Narberth, Pa., reacts as he receives a Pfizer COVID-19 vaccination from registered nurse Alicia Jimenez at a Montgomery County, Pa., Office of Public Health vaccination clinic at the King of Prussia Mall, Tuesday, May 11, 2021, in King of Prussia., Pa.(AP Photo/Matt Slocum)

MISSION, Kan. — Parents, schools and vaccine clinics rushed to begin inoculating younger adolescents Tuesday after U.S. regulators endorsed Pfizer’s COVID-19 vaccine for children as young as 12.