Johnson & Johnson single-dose vaccine provides strong shield against COVID

An illustration shows vials with COVID-19 vaccine stickers attached and syringes with the logo of US pharmaceutical company Johnson & Johnson on Nov. 17, 2020. In a large, late-stage trial the Johnson & Johnson one-shot vaccine prevented 66% of moderate to severe cases of COVID-19. (Justin Tallis/AFP/Getty Images/TNS)

Johnson & Johnson’s one-shot vaccine generated strong protection against COVID-19 in a large, late-stage trial, raising hopes that it can rapidly reshape a stumbling immunization campaign.