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FILE – Lucas Kittikamron-Mora, 13, holds a sign in support of COVID-19 vaccinations as he receives his first Pfizer vaccination at the Cook County Public Health Department, May 13, 2021 in Des Plaines, Ill. The U.S. is expanding COVID-19 boosters as it confronts the omicron surge, with the Food and Drug Administration allowing extra Pfizer shots for children as young as 12. Boosters already are recommended for everyone 16 and older, and federal regulators on Monday, Jan. 3, 2022 decided they’re also warranted for 12- to 15-year-olds once enough time has passed since their last dose. (AP Photo/Shafkat Anowar, file)