FILE – A nurse holds a vial of the Pfizer COVID-19 vaccine for children ages 5 to 11, right, and a vial of the vaccine for adults, which has a different colored label, at a vaccination station in Jackson, Miss., Tuesday, Feb. 8, 2022. U.S. regulators authorized a COVID-19 booster shot for healthy 5- to 11-year-olds on Tuesday, May 17, 2022, hoping an extra vaccine dose will enhance their protection as infections once again are on the rise. (AP Photo/Rogelio V. Solis, File)