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A "stomach virus" does not affect the stomach -- it affects the small intestine. This eMedTV article identifies the four types of viruses that may cause a stomach virus, describes the symptoms they cause, and explains how they are treated.
Rotavirus is a virus that may cause severe diarrhea, fever, and vomiting. As this eMedTV article explains, almost all children in the United States are likely to be infected with a rotavirus before their fifth birthday.
Norovirus gastroenteritis ("stomach flu") is a contagious illness that can cause diarrhea and vomiting. This eMedTV article discusses norovirus gastroenteritis in more detail, including information about how it is transmitted, treated, and prevented.
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