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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.
After approximately 1 to 2 days, depending on the virus, stomach flu symptoms can appear. This period between the stomach flu transmission and the start of symptoms is the stomach flu incubation period.. In some cases, the stomach flu incubation period can be as short as 4 hours.hether or not a person is contagious during the stomach flu incubation period will depend on which stomach flu virus the person is infected with. For example, with a rotavirus infection, the person is contagious during the stomach flu incubation period.