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How effective does a COVID-19 coronavirus vaccine need to be to stop the pandemic? New study has the answer

How effective does a COVID-19 coronavirus vaccine need to be to stop the pandemic? New study has the answer
The U.S. is pinning its hopes on a COVID-19 coronavirus vaccine, but will a vaccine alone be enough to stop the pandemic and allow life to return to normal? The answer depends on a how “good” the vaccine ends up being.

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