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2:08
Yahoo
Reuters Videos
Pfizer, Moderna highly effective in real-world U.S. study: CDC
The risk of infection fell 90% by two weeks after the second shot, the study of just under 4,000 vaccinated U.S. healthcare personnel and first responders found.\nThe study by the U.S. Centers for Disease Control and Prevention (CDC) evaluated the vaccines' ability to protect against infection, including infections that did not cause symptoms ...
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Mar 29, 2021
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