via aerosol...
http://english.elpais.com/society/2020-10-28/a-room-a-bar-and-a-class-how-the-coronavirus-is-spread-through-the-air.html
"These are respiratory droplets that are less than 100 micrometers in diameter that can remain suspended in the air for hours"
It appears the big bugaboo is insufficient ventilation, a HUGE problem come winter.
Check out the scenario showing minutes elapsed.
Not to panic or make paranoid, just to encourage extra caution. Aerosol droplets can also enter eyes so good eye protection and watching the amount of time spent indoors without ventilation is critical.
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