Wearing two masks and making sure they fit tightly increases protection: experiments by US CDC
2021-02-10
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 pixabay.com (creative commons))
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Conrad Theodore Seitz 