Posted in Web What We Know About the Side Effects of Pfizer’s COVID-19 Vaccine February 28, 2021 The Pfizer-BioNTech COVID-19 vaccine is administered in two doses, 3 weeks apart. To date, safety data on the vaccine has been collected from 37,586 participants enrolled in an ongoing phase 3… https://www.healthline.com/health-news/what-we-know-about-the-side-effects-of-pfizers-covid-19-vaccine