Just for completion. The current understanding is that the transmission mechanisms for Covid-19 are: 1. Contact 2. Droplets (particles > 20 microns), AND 3

Just for completion. The current understanding is that the transmission mechanisms for Covid-19 are: 1. Contact 2. Droplets (particles > 20 microns), AND 3. Aerosol (particles < 5/10 microns) The last one - Aerosol transmission - really adds to why this virus is so infectious. Unlike balistic droplets, an aerosol plume can stay in a room for a very long time after someone coughs or sneezes. An aerosol plume can stay in the air long after someone flushes fecal matter down a toilet. As a comparison aerosol transmission is what makes tuberculosis and measle so challenging in terms of containment and infection rate.