AstraZeneca says its vaccine shows 76 percent efficacy after questions arise about 'outdated information'

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Mar 24, 2021 AstraZeneca says its vaccine shows 76 percent efficacy after questions arise about 'outdated information' AstraZeneca said Wednesday that results from an analysis of a U.S. trial show its vaccine is safe and 76 percent effective against symptomatic Covid-19. Earlier this week, federal health officials questioned the company's previously reported 79 percent efficacy rate, saying that it may have been based on "outdated information."  Read More Get the NBC News Mobile App Follow NBC News Check out all of NBCNEWS Newsletters here. Update Preferences | Unsubscribe | Contact | Privacy Update Preferences Unsubscribe Contact Privacy