Vaccine Refusal May Put Herd Immunity At Risk, Researchers Warn

Nearly a third of adults in the U.S. have gotten at least one shot of the COVID-19 vaccine so far, but researchers warn that vaccine refusal may keep the country from reaching herd immunity.

One in four Americans say they won't get a coronavirus vaccine. Researchers say it could keep the nation from reaching a critical tipping point.

(Image credit: John Tlumacki/The Boston Globe via Getty Images)

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