A vital new study shows how well masks work—and why we need better ones
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The study comprised two parts: testing how to best promote mask-wearing, and quantifying the effectiveness of the usage.
Throughout the COVID-19 pandemic, guidance on mask-wearing has varied tremendously across, and within, countries—as have the methods used to encourage mask use and enforce mask mandates. If authorities in places that have shunned masks are claiming that’s due to a lack of substantial evidence of their effectiveness in mitigating the community spread of COVID-19, a first-of-its-kind study now fills that gap in data.