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abstractpubmed· Abstract 2021· item PMID:34224270
The single-dose J&J vaccine had 67% efficacy against moderate to severe-critical COVID-19 at ≥14 d. SOURCE CITATION: Sadoff J, Gray G, Vandebosch A, et al. Safety and efficacy of single-dose Ad26.COV2.S vaccine against Covid-19. N Engl J Med. 2021. [Epub ahead of print.] 33882225.