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Vaccine Refusal May Put Herd Immunity At Risk, Researchers Warn

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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. (The Boston Globe via Getty Images)
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. (The Boston Globe via Getty Images)

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