A 1-year-old girl is brought to the emergency room by her parents who report she has had a fever and diarrhea for 3 days. Her temperature is 38degC (101degF). The CBC shows a normal WBC count and increased hematocrit (48 g/dL). Which of the following is the most likely cause of increased hematocrit in this patient?

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Vikas Bhardwaj
Medical Technologist, AIIMS New Delhi
Updated: Apr 17, 2026