A nurse gives Malikai McPherson, 16, a shot of the vaccine...

MELBOURNE, FLORIDA, UNITED STATES - 2021/05/17: A nurse gives Malikai McPherson, 16, a shot of the vaccine at a vaccination clinic at Health First Medical Centre. On May 12, 2021, the CDC approved the use of the Pfizer BioNTech vaccine in 12 through 15-year-old adolescents. Vaccinating this age group is seen as a keyway for middle and high schools to reopen fully by this fall. (Photo by Paul Hennessy/SOPA Images/LightRocket via Getty Images)