Failed face mask trial shows why more masks are needed

Back in the early days of the COVID-19 pandemic, researchers in Denmark decided to conduct an usual experiment to test the infection-fighting power of face masks the same way they’d evaluate a potential vaccine or drug.

At the time, mask use was not recommended by Danish health authorities, and fewer than 5% of residents used them outside of hospital settings. Those conditions made it possible to conduct the first — and only — randomized controlled trial of the face coverings.


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