Two cases of <i>Aeromonas hydrophila</i> colitis

Aeromonas hydrophila is a rod-shaped, gram-negative bacterium typically found in aquatic environments, including in drinking water, wastewater, sewage, and food. Herein, we describe two cases of A. hydrophila colitis. The patient in Case 1 was a woman in her eighties who had been diagnosed with hypertension, type 2 diabetes, and dyslipidemia. An annual colonic endoscopy revealed erosion, redness, and ulceration in the cecum and ascending colon. A. hydrophila was detected in endoscopic stool sample culture. The infection route was unclear. The patient in Case 2 was a woman in her seventies who had been diagnosed with hypertension and dyslipidemia and presented to our hospital with lower abdominal pain and lower gastrointestinal bleeding. Emergency colonic endoscopy revealed erosion, redness, and ulceration in the cecum and type 2 colon cancer of the ascending colon. A. hydrophila was detected in endoscopic stool sample culture. The infection route was unclear.