AP21314083331089-1-1024×640.jpg

Leo Hahn, 11, gets the first shot of the Pfizer COVID-19 vaccine, Tuesday, Nov. 9, 2021, at the University of Washington Medical Center in Seattle. Last week, U.S. health officials gave the final signoff to Pfizer’s kid-size COVID-19 shot, a milestone that opened a major expansion of the nation’s vaccination campaign to children as young as 5. (AP Photo/Ted S. Warren)