Covid mRNA vaccines have 66 percent anti-delta efficacy

Thousands of these workers were tested every week in six US states. Aug 25, 2021 at 10:33 am TASR WASHINGTON. The efficacy of the mRNA vaccines from Pfizer / BioNTech and Moderna against coronavirus dropped from 91 percent before the delta variant to 66 percent after the delta. This is the result of an extensive […]