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Did you receive some KN95 masks at your service and have a concern about their clinical use? Here is some guidance from the FDA released on 4/3/2020.

The US Food and Drug Administration on Friday changed its position on a sought-after type of respirator from China, the KN95.

In response to continued respirator shortages, the FDA issued new guidance, authorizing KN95 respirators if certain criteria are met, including evidence demonstrating that the respirator is authentic.
The move comes after conflicting government guidance caused confusion over how these masks should be used and whether they could be imported into the US.

The FDA did not include these masks on its initial guidance for emergency use issued last month, but the Centers for Disease Control and Prevention said the KN95 masks are "expected to be suitable alternatives" to the N95 masks during the coronavirus pandemic when supplies are short.

Note that during a time of N95 shortages and lack of ability to fit test a wearer should still Fit check. This is a check that should be carried out by the employee/wearer of the device each time that they put it on, even if this occurs several times per day. Although not a formal requirement like fit testing, a fit check is good practice that gives an indication that the respirator is positioned correctly.