New COVID-19 variants could diminish vaccine efficacy

COVID-19 is mutating. And while early data suggest vaccines will be effective against more infectious COVID-19 variants that emerged in the U.K., South Africa and Brazil, the mutations could have a measurable impact on vaccine efficacy.  

There’s perhaps a 50/50 chance that such new variants could lead to a “numerically meaningful drop” in vaccine efficacy, said Shane Crotty, a virologist at the La Jolla Institute for Immunology, in a UBS briefing call. 

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