AstraZeneca Covid Vaccine Efficacy Revised to 76%

AstraZeneca has lowered its Covid-19 clinical trial vaccine efficacy rate from 79% to 76% after conducting a “primary analysis” following a data and safety monitoring board concern that the company may have included outdated information (see story) in releasing information earlier this week.“ The primary analysis is pre-specified in the protocol and will be the basis for a regulatory submission for Emergency Use Authorization to the U.S. Food and Drug Administration in the coming weeks,” the company says. The vaccine also showed 100% efficacy in preventing severe or critical disease and hospitalization, it says, adding that there were eight cases of severe Covid-19 and all were in the placebo group.

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