FILE - Elsa Estrada, 6, smiles at her mother as pharmacist Sylvia Uong applies an alcohol swab to her arm before administering the Pfizer COVID-19 vaccine at a pediatric vaccine clinic for children ages 5 to 11 set up at Willard Intermediate School in Santa Ana, Calif., Nov. 9, 2021. As of Tuesday, Jan. 11, 2022, just over 17% of children in the U.S. ages 5 to 11 were fully vaccinated, more than two months after shots for them became available. (AP Photo/Jae C. Hong, File)