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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.](https://woub.org/wp-content/uploads/2021/04/covid-vaccine-99fdbcb9cb3d02f3228fc8acee5460d71feb6b02-e1617808320985-900x422.jpg)
Vaccine Refusal May Put Herd Immunity At Risk, Researchers Warn
By: Geoff Brumfiel | NPR
Posted on:
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.