Vaccine Effectiveness against Delta Covid-19 Variant The | UPDATES IN MEDICINE
Vaccine Effectiveness against Delta Covid-19 Variant
The B.1.617.2 (delta) Covid-19 variant has surged in India and spread worldwide. In a test-negative case–control study, the effectiveness of two doses of BNT162b2 (Pfizer) was 94% against the B.1.1.7 (alpha) variant and 88% against delta; with the ChAdOx1 nCoV-19 (Oxford, AstraZeneca) vaccine, effectiveness was 74% and 67%, respectively. Protection after a single vaccine injection was low; two doses are needed.
