The FDA has granted a request
from the Centers of Disease Control and Prevention (CDC) for an
emergency use authorization to allow healthcare personnel to use certain
industrial respirator face masks, including N95s, as an extra preventative measure against COVID-19.
The industrial face masks achieve a closer facial
fit than surgical masks and are more efficient filterers of airborne
particles. Since they are used in construction and other industrial
environments, they are not required to meet FDA standards for testing.
https://seekingalpha.com/news/3547927-fda-oks-emergency-use-of-respirator-face-masks-for-covidminus-19
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