Very interesting article by a scientist, and if correct would explain why countries who wear masks routinely have fewer cases. Well, one of the reasons. Also why the virus spreads so easily amongst populations and became a pandemic so rapidly.
https://www.medscape.com/viewarticle/931320?nlid=1357232823&src=WNLLmdplsnews2005299mscpedit_nurs&uac=231210SV&spon=24&impID=2399615&faf=1