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Wearing two masks and making sure they fit tightly increases protection: experiments by US CDC


The United States Centers for Disease Control (CDC) conducted experiments in January to determine the effectiveness of wearing a cloth mask over a three-ply medical procedure mask and found them encouraging. They estimated that wearing two masks reduces exposure by more than 90% under laboratory conditions.

If both source and recipient of potentially infected aerosols wear double masks, then exposure is reduced 96%.

The CDC report, dated February 10, 2021, is available here.

(corona photo by mohamed Hassan courtesy of (creative commons))

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