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Pfizer's Vaccine 94% Effective at Preventing Covid, Study Finds
Posted
February 25, 2021
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February 25, 2021
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1:37Now PlayingPfizer Inc. and BioNTech SE’s Covid-19 vaccine was overwhelmingly effective against the virus in a study that followed nearly 1.2 million people in Israel, results that public-health experts said show that immunizations could end the pandemic.
Two doses of the vaccine prevented 94% of Covid-19 cases in 596,618 people vaccinated between Dec. 20 and Feb. 1, about one-quarter of whom were over the age of 60, teams from the Clalit Research Institute and Harvard University reported in a study published Wednesday in the New England Journal of Medicine.
The researchers matched each vaccinated person with someone who hadn’t gotten a shot, enabling the best analysis yet of whether extremely good results from an earlier clinical trial would hold up in the real world. The Pfizer-BioNTech shot cleared every hurdle. It was so effective, in fact, that outside experts said that with broad enough use it may be possible to halt the pandemic.
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