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Tuesday, November 17, 2020

What does COVID-19 vaccine effectiveness mean?

November 17, 2020 Modernhealthcare-Health News , 0 Comments

U.S. health officials said a coronavirus vaccine would need to be at least 50% effective before they would consider approving it for use. There was concern that coronavirus vaccines might be only as effective as flu vaccines, which have ranged from 20% to 60% effective in recent years.



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