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A1. Droplets are ballistic projectiles, they infect by impacting on eyes, nostrils or mouth. They are > 100 umAerosols float in the air from tens of sec to hours, and
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A2.(1) Major historical error in 1910 became paradigm: + correct observation (ease of infection in close proximity) was misinterpreted as being due to ballistic droplets+ Stated that aerosol infection was
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