Diarrhea: 12.9% (18/139)Present on admission9/82 nonsevere cases and 9/57 severe casesNausea: 17.3% (24/139)Present on admission19/82 nonsevere cases and 5/57 severe casesVomiting: 5.0% (7/139)Present on admission5/82 nonsevere cases and 2/57 severe casesBelching 5.0% (7/139)Present on admission4/82 nonsevere cases and 3/57 severe casesAbdominal pain: 5.8% (8/139)Present on admission2/82 nonsevere cases and 6/57 severe casesOther pathogens were detected including Mycoplasma pneumoniae in 5, respiratory syncytial virus in 1, Epstein-Barr virus in 1.