Humans are the only known hosts. The viruses are passed in the stool of infected persons.
So the only way to get this virus is by eating the poop of a infected human.
Norwalk and Norwalk-like viruses have been linked to outbreaks of intestinal illness on cruise ships and in communities, camps, schools, institutions, and families.
Which means there are whole groups of people being fed human poop.
Schools? Institutions? I wonder what the common factor/ carrier could be.
I don't know about the rest of you but I have to wonder about an adult who needs told to wash their hands after sitting on the pot.
I myself wash up every time I exit the 'facility', and numerous times thereafter.
About 'show chefs', sure they are not shown washing their hands. As has been mentioned it would take too much time out in the show.
I see them doing a whole lot of other things they shouldn't be doing. IE: The comments on Puck.