While many people call it the "stomach flu," norovirus illness is not actually related to the flu caused by the influenza virus. Norovirus is a very contagious virus that causes vomiting and diarrhea. People of all ages can get infected and sick with norovirus. Cases spike in winter and spring, December through April, and while the virus is hard to avoid, these simple steps help protect you and your family. | Adventist Health