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Gastro-enteritis due to Vibrio Cholera was increased suddenly in summer of 1998 in our country. In this research we studied epidemiological and clinical features of Cholerae patients. Vibrio Cholera isolated from 189 (3.3%) patients from 56II stool samples. 182 (96.2%) Vibrio Cholera O1 isolated. 46 (24%) patients with positive stool cultures for Vibrio Cholera were hospitalized. 50% patients were 15-45 yrs. No sex predominency was seen. The important observations in this study including: Fever in 28.1% (13) of patients, sever leukocytosis in 15% (7) of patients, RBC in stool in 33% (15) of patients. Fever and neutrophilia and RBC in stool probably shows co-infection with order intestinal pathogens or different serotypes of Vibrio Cholera with new characteristics. So we are recommending extensive research to be done on serotyping of all of the isolates of Vibrio cholera and other intestinal pathogens simultaneously.