Hello my stomach was sick ?

WAS better than IS: Posting is too vague. But, contagiousness varies among different "stomach viruses" and among different people, so is not easily predictable. However, one can feel safer if the sick person wakes up on Day 5 without any symptoms the preceding 4 days. If unlucky, one can still catch the virus from the recovering person. Food poisoning is usually less contagious, but depends on the bacteria type.