AstraZeneca’s Covid-19 vaccine is 79% effective; FDA submission on the way March 22, 2021 Auto Bot AstraZeneca, BioPharma, Cambridge, Pharma, U.K., University of Oxford, Vaccines 0 AstraZeneca reported that its Covid-19 vaccine was 79% effective at preventing severe infection and 100% effective at preventing hospitalization. The company expects to file a submission seeking FDA emergency use authorization in coming weeks.