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Pfizer says its coronavirus vaccine is 90 percent effective

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With new coronavirus cases and hospitalizations surging across the country and around the world, Pfizer and another company are announcing promising results for their vaccines. NBC national correspondent Miguel Almaguer reports for TODAY.

Appearing:Savannah Guthrie
Tags: health, news, Editor's picks, big news, coronavirus, today
S2020 E02 minHighlightNews and InformationDaytime


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