Nearly 4,400 adverse events reported in U.S. after receiving Pfizer-BioNTech COVID-19 vaccine

WASHINGTON, Jan. 6 (Xinhua) -- Nearly 4,400 adverse events were reported after receipt of Pfizer-BioNTech COVID-19 vaccine as of Dec. 23, with 21 cases determined to be anaphylaxis, according to a reported released by the U.S. Centers for Disease Control and Prevention (CDC) on Wednesday.

The U.S. Food and Drug Administration issued an Emergency Use Authorization for Pfizer-BioNTech COVID-19 vaccine on Dec. 11, administered as 2 doses separated by 21 days.