A 38-year-old man returns from a 1-week trip to Africa, where he had sampled the local cuisine and drank the water. On his return, he develops fever and bloody diarrhea. Other symptoms included abdominal pain, nausea and vomiting. His symptoms did resolve independently over the course of the next week. Within a few days of gastrointestinal symptom resolution, the patient developed neurologic symptoms consistent with Guillan-Barre syndrome. Which of the following gastrointestinal illnesses is he most likely to have contracted?
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