Abu-Raddad LJ, Chemaitelly H, Butt AA; National Study Group for COVID-19 Vaccination. Effectiveness of the BNT162b2 Covid-19 Vaccine against the B.1.1.7 and B.1.351 Variants. N Engl J Med. 2021 Jul 8;385(2):187-189. doi: 10.1056/NEJMc2104974. Epub 2021 May 5. PMID: 33951357 Article uri icon

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