Cryptosporidium

Summary of Cryptosporidium
Cryptosporidiosis is a parasitic disease caused by Cryptosporidium, a genus of protozoan parasites. It affects the distal small intestine in both immunocompetent individuals (in whom it causes mild watery diarrhea) and immunocompromised (e.g., persons with AIDS) individuals (in whom it causes severe, potentially fatal diarrhea). It is primarily spread through the consumption of oocysts in contaminated water, and identification is via acid-fast staining. Prevention is accomplished by filtration of city water supplies, and treatment in immunocompetent patients is with nitazoxanide.

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Cryptosporidium

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Cryptosporidium

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Cryptosporidium is transmitted via .

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A 45-year-old man comes to the clinic because of diarrhea, nausea, and abdominal pain. He has had voluminous bowel movement since yesterday. He did not notice any blood in his stool. He has had diarrhea on and off for the past few months, but it has recently gotten much worse. His temperature is 38.3°C (101°F), pulse is 90/min, respirations are 18/min, and blood pressure is 115/75 mm Hg. He has a history of intravenous drug use. Physical examination shows white plaques on his buccal mucosa and tongue that can be scrapped off. Modified acid-fast staining of a stool sample shows pink oocysts. Which of the following is the most likely cause of this patient's diarrhea?

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