The exterior of Chinese factory Shanghai Dasheng in Shanghai, China, May 6, 2020. An AP investigation has tracked counterfeit N95 masks produced by Shanghai Dasheng entering the U.S. mediical supply ...

Ideally, everyone (not just medical workers) should be using a KN95 or N95 mask for optimal protection when COVID cases are high or when there's a contagious variant like Omicron, according to the ...