CBS Evening News | U.S. study finds AstraZeneca vaccine 79% effective

U.S. study finds AstraZeneca COVID vaccine 79% effective

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AstraZeneca announced its coronavirus vaccine is 79% effective in U.S. clinical trials and 100% effective in preventing serious illness. Meg Oliver reports. Air Date: Mar 22, 2021

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CBS Evening News | U.S. study finds AstraZeneca vaccine 79% effective

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