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We know face masks help stop the spread of COVID. This simple chart shows just how much

Even though face masks have become highly politicized, science shows that wearing a mask does in fact reduce virus transmission. Still, the data varies on the degree that it helps, so one research team set out to provide a clearer way to understand it.

By doing a meta-analysis of a number of studies, researchers at the University of Washington’s Institute for Health Metrics and Evaluation (IHME) found that if 95% of people wear masks, it reduces transmission by 30%. NPR put these findings into chart form, showing what happens when people don’t wear masks compared to what happens when 95% of the population masks up.

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