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Effectiveness of Face Masks in Preventing Airborne Transmission of SARS-CoV-2 – American Society for Microbiology

Airborne simulation experiments showed that cotton masks, surgical masks, and N95 masks provide some protection from the transmission of infective SARS-CoV-2 droplets/aerosols; however, medical masks (surgical masks and even N95 masks) could not completely block the transmission of virus droplets/aerosols even when sealed.

https://msphere.asm.org/content/5/5/e00637-20