A1. Droplets are ballistic projectiles, they infect by impacting on eyes, nostrils or mouth. They are > 100 um

Aerosols float in the air from tens of sec to hours, and they infect by inhalation. They are < 100 um

(5 um boundary is a long-standing error)

#LeapsChat @leapsmag https://twitter.com/leapsmag/status/1309191259697950721">https://twitter.com/leapsmag/...

A1(2): Some debate on twitter about what droplets exactly are. But clearly defined as ballistic projectiles that infect by impact. See this thread where I explained it in detail, or this image from a recent presentation of Deputy Director of ID at CDC
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A1(3). And the thread that has all the gory details about the history and definition of droplets and aerosols is at:

https://twitter.com/jljcolorado/status/1307918933391933441

https://twitter.com/jljcolora... href="https://twtext.com//hashtag/LeapsChat"> #LeapsChat @leapsmag

https://twitter.com/jljcolorado/status/1307918933391933441