British study shows COVID-19 vaccine efficacy wanes under Delta
A British study found that protection from either of the two most commonly used COVID-19 vaccines against the Delta variant weakens within three months.
Vials with a sticker reading, "COVID-19 / Coronavirus vaccine / Injection only" and a medical syringe are seen in front of a displayed Pfizer logo in this illustration taken October 31, 2020(photo credit: REUTERS/DADO RUVIC/ILLUSTRATION/FILE PHOTO)ByREUTERS
