A patient with a previously compensated hereditary spherocytosis has a severe drop in hemoglobin and reticulocyte count after a parvovirus infection.This represents what type of crisis?

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After some viral infections,particularly with parvovirus B19 (which invades developing red cells and inhibits their growth),a severe drop in hemoglobin can occur.This is termed an aplastic crisis.

A Patient with a Previously Compensated Hereditary Spherocytosis Has a Severe