Investigators also notified about 6,000 potential victims in at least 12 states including hospitals who may have unknowingly purchased knockoffs.
Some manufacturers can't get their masks into the hands of healthcare workers, so they're hoping you'll buy them instead.
Fake 3M masks were sold in at least five states to hospitals, medical facilities and government agencies.
South Korea's KF94 face mask is comparable to both the American N95 and Chinese KN95.
Wearing two face masks during the pandemic may be a super-effective way to protect yourself against new coronavirus variants.
Some governors described the early PPE marketplace as the Wild West, where supplies simply went to the highest bidder.
Camilla Luddington had words for Twitter criticism that actors on the ABC medical drama were wearing N95 respirators instead of cheaper masks between takes.
A Duke University team’s test of 14 different masks wasn’t perfect, but it raised some important questions for further research.
“We’re five months into this and there are still shortages of gowns, hair covers, shoe covers, masks, N95 masks,” said the president of National Nurses United.
After the first COVID-19 case was detected in January, a company offered to make millions of N95 masks. A federal agency said no.