A 25-year-old woman was admitted to the hospital with relapsing fevers, headache, and dyspnea. An elective splenectomy had been performed 4 years earlier for hereditary spherocytosis. Laboratory studies showed leukocytosis, anemia, and multiple intraerythrocytic ring forms on a peripheral-blood smear. The dyspnea worsened, and hypoxemia developed. A therapeutic procedure was performed.
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