DistrictDeacon
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99+% effectiveness is not a huge failure rate, in my opinion. Especially when worn under a full face shield. But at least you are consistent between that and covid death rates, I guess.
The FDA and CDC reported Thursday that new U.S. testing showed dozens of the Chinese masks failed to meet that 95% level. Some of the masks filtered as little as 20% of particles, according to the testing information from the CDC.