Safety and Efficacy of Single-Dose Ad26.COV2.S Vaccine against Covid-19.
N Engl J Med. 2021 Jun 10;384(23):2187-2201. doi: 10.1056/NEJMoa2101544. Epub 2021 Apr 21.
N Engl J Med. 2021.
PMID: 33882225
Free PMC article.
Clinical Trial.