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A 50-year-old man returns to his home in Minnesota after a diving trip to Belize in Central America. The day after his return, he comes to the physician because of diarrhea, abdominal cramps, and nausea. He reports that the stools do not appear to contain mucus or blood. His temperature is 37.0°C (98.6°F), vital signs are otherwise normal. Microscopic examination of a stool sample reveals no leukocytes. Which of the following is the most likely pathogen?
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