A 40-year-old gay man with HIV infection complains of intermittent crampy abdominal pain and diarrhea for 2 months. The major concern is 1-3 loose stools daily accompanied by bloating. He took AZT, ddI, and indinavir, but discontinued this when he noted the abdominal symptoms. Nevertheless, there was no improvement. He has been well otherwise and afebrile. He has a CD4 count of 350/mm3. The most likely diagnosis is:a. Salmonellosisb. C. difficile colitisc. Microsporidiad. Irritable bowel syndromee. Kaposis sarcoma of the gut

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