How efficient is wearing a surgical mask to prevent respiratory influenza-like illnesses, or respiratory illnesses believed to be transmitted by droplets and aerosol particles?
From my humble research, the largest covid particle is 0.15 micrometers.
Aerosol particles are around less than 0.25 micrometers.
Masks supposedly are only efficient on particles 0.3 micrometers or above.
So simply, does that mean masks do not work at preventing the transmission of COVID? Please share with me some insight.