_:vb50950747 . _:vb50950747 "url:http://www.merck.com/mmpe/sec02/ch013/ch013c.html"^^ . _:vb50950747 . _:vb50950747 . _:vb50950747 "A gastrointestinal system infectious disease that involves inflammation of the stomach lining caused by viruses. The symptoms include abdominal pain, indigestion, ulcer formation, abdominal bloating, nausea and vomiting."^^ . _:vb50950747 . _:vb50950747 .