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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.
A virus causes stomach flu or gastroenteritis. The most common viruses are rotavirus or norovirus. Symptoms appear one to three days after exposure to the virus. You are contagious before you even begin to develop symptoms. Even after youâve recovered from your symptoms, you can remain contagious for up to two weeks.hese viruses can be contracted from food that was inadequately prepared or in conditions with poor hygiene. People with the stomach flu often have symptoms of diarrhea, nausea and vomiting, fever, headache, and sore muscles. Depending on the type of virus you have, the flu can last from one to 10 days.