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Early symptoms of stomach flu - What are the usual symptoms of stomach flu? Misnomer. This may be an infection, often a virus, characterized by diarrhea and vomiting. Repeated such episodes can often be due to bad diet.
When a person becomes infected with stomach flu, the virus begins to multiply within the small intestine. 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.his 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.