The Whitehall Ledger - Serving Southern Jefferson County in the Great State of Montana

By Matthew Herper
www.StatNews.com 

AstraZeneca: Efficacy of its COVID-19 Vaccine

 

March 31, 2021



Rejecting sharp criticism from U.S. government scientists, AstraZeneca said March 24th that its Covid-19 vaccine was 76% effective at reducing the risk of symptomatic Covid-19, and 100% effective against severe disease, in a new analysis of its large U.S.-based clinical trial.

Those estimates were just a few percentage points lower than much more sparse results the company released Monday from an earlier analysis of the study, despite dramatic statements from government scientists that AstraZeneca’s initial release may have used “outdated information” that could have been overly favor...



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