Kidney transplant patient Sophia Silvaamaya, 5, is escorted by Dr. Bear and her father, Pedro Silvaamaya, to receive her COVID-19 vaccination, 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)