The FDA authorizes Pfizer’s COVID-19 vaccine for children ages 5 to 11 – a pediatrician explains how the drug was tested for safety and efficacy Posted byDebbie-Ann Shirley October 29, 2021 Leave a comment on The FDA authorizes Pfizer’s COVID-19 vaccine for children ages 5 to 11 – a pediatrician explains how the drug was tested for safety and efficacy Pediatric clinical trials for the COVID-19 Pfizer vaccine for children ages 5 to 11 have shown that the Pfizer shot is safe and effective.