Finn Washburn, 9, receives an injection of the Pfizer-BioNTech COVID-19 vaccine in San Jose, Calif., on Wednesday, Nov. 3, 2021, as his sister, Piper Washburn, 6, waits her turn. The U.S. entered a new phase Wednesday in its COVID-19 vaccination campaign, with shots now available to millions of elementary-age children. (AP Photo/Noah Berger)