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Review Question - QID 109972

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QID 109972 (Type "109972" in App Search)
A 23-year-old man comes to his primary care provider after having severe abdominal cramping and diarrhea beginning the previous night. He denies any fevers or vomiting. Of note, he reports that he works in a nursing home and that several residents of the nursing home exhibited similar symptoms this morning. On exam, his temperature is 99.7°F (37.6°C), blood pressure is 116/80 mmHg, pulse is 88/min, and respirations are 13/min. His stool is cultured on blood agar and it is notable for a double zone of hemolysis. Which of the following organisms is the most likely cause?