Vaccines targeting the coronavirus strain that spread in early 2020 and their effectiveness against infection has dropped markedly as new mutants came along, particularly the super-contagious omicron family. Pfizer seeks approval of updated COVID vaccine booster against new variants Pfizer asked U.S. regulators Monday to authorize its combination COVID-19 vaccine that adds protection against the newest omicron relatives — a key step toward opening a fall booster campaign. The Food and Drug Administration ordered vaccine makers to tweak their shots to target BA.4 and BA.5 that are better than ever…
Read MorePfizer seeks approval of updated COVID vaccine booster against new variants
