A 12-year-old boy with acute gastroenteritis caused by Edwardsiella tarda O4:H4.

A 12-year-old boy was brought to the hospital with a 3-week history of watery diarrhea mixed with mucus and colicky abdominal pain. Stool culture identified Edwardsiella tarda O4: H4, and no other pathogenic bacteria were detected. Acute gastroenteritis caused by Edwardsiella tarda O4: H4 was diagnosed. This bacterium was shown to be sensitive to ampicillin hydrate. When this antibiotic was administered, the condition of the patient improved within a week. The patient had a history of eating raw shrimp and fish while traveling with his parents.