IMPORTANCE 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.
Do you know the infectious concentration of SARS CoV 2 in inhaled air necessary to initiate an infection?
Do you think that the achieved concentration is more, the same, or less after passing through two masks (source and target)?