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Pfizer, Moderna highly effective in real-world U.S. study: CDC

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The COVID-19 vaccines developed by Pfizer Inc with BioNTech SE and Moderna Inc are highly effective and reduced the risk of infection by 90% by two weeks after the second shot among healthcare personnel and first responders, according to a the U.S. study released on Monday, CDC Director Rochelle Walensky said.

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