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    COVID-19 Vaccines Have Prevented Deaths, Contrary to Misleading Graphic on Social Media

    by Saranac Hale Spencer Mar 02, 2022 6 minutes

    SciCheck Digest

    Studies have shown that COVID-19 vaccines have prevented severe disease and deaths. But bogus claims that they don’t work continue to circulate online. One claim relies on a misleading graph showing cumulative deaths in the U.S., but omits information about the number of deaths among the vaccinated versus unvaccinated since the shots became available.

    How effective are the vaccines?

    All of the authorized and approved vaccines are effective at preventing symptomatic disease.

    The Pfizer/BioNTech vaccine, which is the first COVID-19 vaccine to receive full approval from the Food and Drug Administration, showed a final efficacy of 91% against symptomatic illness in its phase 3 trial, meaning that under the conditions of the trial the vaccine reduced the risk of getting sick by 91%. The Moderna vaccine showed similar results in its clinical trial, with an efficacy of 94% against disease at the time of emergency use authorization.

    Johnson & Johnson, which partly tested its vaccine in South Africa when the emerged, an efficacy of 66% in preventing moderate to severe COVID-19 and an efficacy of 85% in preventing

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