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True theyre most effective if the infected are wearing them, but why do you say they'd block the virus itself?Depends on if the person is wearing it properly, and by that I mean IF there is a good seal between mask and FACE. Assuming there is, then the mask are pretty good at blocking toxic dust and organic vapors and the novel coronovirus, but the virus also appears to be transmitted through touch. What is more effective as a preventative measure is for people who have the virus to wear them, so they don't spread it. I've used cartridge type masks and N95 masks to mitigate the effects of VOCs and toxic dust.