Kidney transplant patient Sophia Silvaamaya, 5, held by her father Pedro Silvaamaya, is vaccinated by nurse Kelly Vanderwende, Wednesday, Nov. 3, 2021, at Children’s National Hospital in Washington. The U.S. enters a new phase Wednesday in its COVID-19 vaccination campaign, with shots now available to millions of elementary-age children in what health officials hailed as a major breakthrough after more than 18 months of illness, hospitalizations, deaths and disrupted education. (AP Photo/Carolyn Kaster)