Deborah Sampson, left, a nurse at a University of Washington Medical Center clinic in Seattle, gives a Pfizer COVID-19 vaccine shot to a 20-month-old child, June 21, 2022, in Seattle. The U.S. on Thursday, Dec. 8, 2022 open doses of the updated COVID-19 vaccines for most children younger than age 5. The Food and Drug Administration's decision aims to better protect the littlest kids from severe COVID-19 at a time when children’s hospitals already are packed with tots suffering a variety of other respiratory illnesses, too. (AP Photo/Ted S. Warren, file)