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34-year-old man presents to urgent care with diarrhea and abdominal pain for the past 24 hours. He reports cramping abdominal pain, 10–12 bowel movements in that period, and blood in his stool. He also states he was feeling feverish for 1 day before the abdominal pain started, but he reports no nausea or vomiting. 2 days ago, he returned from a week-long trip to Guatemala. While there, he visited a petting zoo where he had contact with chickens, cows, and donkeys. He was careful to drink bottled water. He has no significant medical history and is on no medications. His vitals include a BP of 111/70 mm Hg, HR of 74 bpm, RR of 14/min, T of 99.0°F, and SpO2 of 99% on room air. On physical examination, he has dry mucous membranes and is tender to palpation in the periumbilical area. Stool guaiac is positive. Stool studies are negative for ova and parasites. What is the most likely cause of his symptoms?

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