A teenager receives a shot in a clinical trial of Pfizer’s COVID-19 vacine. CINCINNATI CHILDREN’S HOSPITAL By Jennifer Couzin-FrankelFeb. 23, 2021 , 2:55 PM Science’s COVID-19 reporting is supported by the Heising-Simons Foundation. As older adults, health care workers, firefighters, and others roll up their sleeves for a COVID-19 vaccine, there’s […]