https://www.statnews.com/2020/03/16/coronavirus-can-become-aerosol-doesnt-mean-doomed/
When a
new virus blasts out of the animals that harbored it and into people,
experts can usually say, thank goodness it’s not like measles. That
virus is more contagious than any others known to science: Each case of measles causes an astronomical 12 to 18
new cases, compared to about six for polio, smallpox, and rubella. Each
case of the new coronavirus is estimated to cause two to three others.
When we say coronavirus is airborne for 3 hours you have to understand that this statistic was determined as follows: a vial of coronavirus was aerosolized and then sprayed at high velocity into a room. Three hours later there were still viral particles in the air. What this means is that a person with the virus who walks through a room and doesn't cough will not leave much virus in the air and it certainly won't last 3 hours.
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