The U.S. Food and Drug Administration (FDA) first identified possible issues with the most-used COVID-19 vaccine in early 2021 but waited months to disclose the discovery to the public, a new publication revealed.
FDA researchers saw safety signals for two serious conditions among elderly persons following vaccination with Pfizer’s COVID-19 vaccine on Feb. 27, 2021, the researchers disclosed in a new study. The conditions were a lack of oxygen to the heart, or myocardial infarction, and a separate heart condition known as pulmonary embolism.
