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So, if people don't wash their hands well after using the bathroom, they can spread the germs to others before they even know they are going to get sick. People are contagious for at least 3 days after all stomach flu (viral gastroenteritis) symptoms have completely stopped and they feel perfectly fine2.
Quick Answer. Symptoms of a stomach bug or flu typically last from one to three days, according to WebMD, though they may last longer in some cases. Healthline indicates that some forms of stomach viruses may show symptoms for up to 10 days. Cramps, diarrhea and vomiting are the most severe symptoms.