To the best of my knowledge the virus is not airborne, unless you are in the range of a cougher, or sneezer who is a carrier.
The virus does however live on surfaces for some time, which are touched by hands.
Hence washing you hands frequently.
If you touch your face, then you can transfer virus to mouth, nose, eyes, and contaminate yourself.
Which seems to be the main source of infection.
Nothing wrong with washing face, even having a shower if you have been out, and feel vulnerable.
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