Pfizer: COVID-19 Vaccine 91% Effective In Children Posted byCristian Bustos October 22, 2021 Leave a comment on Pfizer: COVID-19 Vaccine 91% Effective In Children Pfizer Inc (NYSE:PFE) says that its COVID-19 vaccine dose for kids is 91% effective at avoiding symptomatic cases in children aged 5 to 11 years. The result was disclosed Friday…