My son had the stomach virus on sunday and the last time he vomited was monday afternoon. it is now thursday night and no one else has gotten it yet are we in the clear or can we still get it. thanks?

No guarantee in life: Contagiousness varies among different "stomach viruses" and among different people, so is not easily predictable. However, one can feel safer if the sick son wakes up on Day 5 without any symptoms the preceding 4 days. If unlucky, she can still catch his virus and come down with the illness. Food poisoning is usually less contagious, but depends on the bacteria type.