How often do normal people get the stomach flu?

Often: If you are in contact with many people on a daily basis for work or school then it is not uncommon to get a "stomach flu" several times a year. The peak season for enteroviruses (stomach flu) is spring and summer. During those seasons children can get sick every month or so especially if they are in a large daycare. The viruses are spread by poor hand washing and contact with contaminated surfaces.