Effectiveness of the BNT162b2 Covid-19 Vaccine against the B.1.1.7 and B.1.351 Variants.

Efficacy of the BNT162b2 mRNA Vaccine in Qatar As of March 31, 2021, more than 265,000 people in Qatar had received both doses of the BNT162b2 vaccine. Viral sequencing indicated that 50.0% of infe...