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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.
The Incubation Period of Stomach Flu. To understand the differences in incubation periods for stomach flu, know that there are two viruses that cause stomach flu: norovirus and rotavirus. Norovirus Norovirus is the most common cause of stomach flu. Most people are contagious from the moment that they become ill.