Pfizer COVID-19 shot expanded to US children as young as 12

FILE - This Jan. 24, 2021, file photo shows a vial of the Pfizer vaccine for COVID-19 in Seattle. U.S. regulators on Monday, May 10, 2021, expanded use of Pfizer's shot to those as young as 12, sparking a race to protect middle and high school students before they head back to class in the fall. (AP Photo/Ted S. Warren, File)