A health worker prepares a dose of the Pfizer-BioNTech vaccine against COVID-19 to be applied to children from 5 to 11 years old, in Mexico City, on June 27, 2022. (Photo by Pedro Pardo/AFP via Getty Images)
By Carla K. Johnson AP Medical Writer Nearly 20 million lives were saved by COVID-19 vaccines during their first year, but even more deaths could…
