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Covid-19 live updates: Pfizer vaccine 90% effective against hospitalization, death six months later, study says - The Washington Post
10/5/21 at 10:16am
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The Washington Post
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Bryan Pietsch Adela Suliman
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The study was based on research from Pfizer and the Kaiser Permanente Southern California health system.
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https://www.washingtonpost.com/nation/2021/10/05/covid-delta-variant-live-updates/
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