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13043 Pathology

A 24-year-old woman with sickle cell disease is seen in the emergency room for an acute upper respiratory tract infection. Laboratory findings reveal severe, normocytic anemia. The patient develops a rapid drop in the hemoglobin level. However, the reticulocyte count is very low (<0.1%). This finding most likely reflects which of the following conditions?

ABone marrow failure due to repeated infarction
BExpected result for the patient's underlying anemia
CParvovirus B19 infection
DRetroperitoneal hemorrhage
Pathology
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