Two hairdressers with COVID-19 did not infect anyone thanks to the mask.

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1 year ago
In Missouri, two hairdressers with symptoms of COVID-19 continued to work and exposed nearly 140 clients in their salon. The clients all wore masks and so did the hairdressers. The bottom line? No secondary contamination.
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https://www.cdc.gov/mmwr/volumes/69/wr/mm6928e2.htm