Efficacy of the ChAdOx1 nCoV-19 Covid-19 Vaccine against the B.1.351 Variant.
N Engl J Med. 2021 May 20;384(20):1885-1898. doi: 10.1056/NEJMoa2102214. Epub 2021 Mar 16.
N Engl J Med. 2021.
PMID: 33725432
Free PMC article.
Clinical Trial.