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Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A 34-year-old woman with HIV comes to the emergency department because of a 2-week history of diarrhea and abdominal cramping. She has had up to 10 watery stools per day. She also has anorexia and nausea. She returned from a trip to Mexico 4 weeks ago where she went on two hiking trips and often drank from spring water. She was diagnosed with HIV 12 years ago. She says that she has been noncompliant with her therapy. Her last CD4+ T-lymphocyte count was 85/mm3. She appears thin. She is 175 cm (5 ft 9 in) tall and weighs 50 kg (110 lb); BMI is 16.3 kg/m2. Her temperature is 38.3°C (100.9°F), pulse is 115/min, and blood pressure is 85/65 mm Hg. Examination shows dry mucous membranes. The abdomen is soft, and there is diffuse tenderness to palpation with no guarding or rebound. Bowel sounds are hyperactive. Microscopy of a modified acid-fast stain on a stool sample reveals oocysts. Which of the following is the most likely causal organism?
assistant
Cryptosporidium parvum