Yes, the Norwalk virus is quite potent as an airborne virus. It starts with the sneezing or vomiting of an infected person. Those tiny water droplets can become airborne and stay airborne for a very long time. They have studied cases of the spread of Norwalk and found that when a person vomits in a crowded room, the chances of others becoming infected are directly proportional to how close they were.
This pic shows the aerosolization of a sneeze.
[img]uploads/images/gumdropper1/C6D_sneeze.jpg[/img]
To learn more about emetophobia, see
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