A 35-year-old male complains of bloody diarrhea, abdominal pain, and mild fever for the last 5 days. He reported spending a 1-week vacation in New Zealand where he camped for 2 days and consumed partially cooked pork. His vital signs are within normal limits. Physical examination is consistent with diffuse abdominal tenderness. Digital rectal examination is remarkable for blood-streaked stool. The patient's stool was sent which grew a bacteria. Which of the following is the most likely cause of the patient's symptoms?

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