No. There is a big difference between food poisoning and just having an upset stomach from a change in diet. If you have ever truly had food poisoning, then you would know the difference right away. And no, they do not shut restaurants down for a few cases of norovirus because that is very hard to prove. You would have to have something really bad, like a seafood restaurant getting a bad batch of shellfish, where the majority of people got sick. But a lot of these cases are norovirus, where someone did not wash their hands properly and touched a few items. Or a bit of produce came in bad. Working in food, you get lettuce recalls at least once or twice a year. So many people are so misinformed about the different types of food poisoning and make blanket statements, like you have. And that is just simply not true.