It’s not just CLOTH masks. No mask is effective against any Virus. This has been studied for years in the past. EVERY SINGLE PAST STUDY resulted in failure.
High-grade surgical masks are designed and shown to MINIMIZE (not eliminate) the transmission of BACTERIAL INFECTIONS in hospital settings. Virus’ are far smaller in size. They cannot be stopped by any mask.
Last year several Virologists and Immunologists described cloth and paper masks as the equivalent of putting a Chainlink Dome over your property to keep mosquitoes out.
Ding ding ding, we finally have a winner!