[Human parvovirus B19-induced aplastic crisis in a case with spherocytosis].

A 43-year-old female with spherocytosis was admitted to the hospital because of fever, headache, and rapidly progressive anemia. On admission, she had severe anemia (Hb 3.9 g/dl) with marked decrease in reticulocytes (0.3%). Some premature leukocytes, such as promyerocyte, were observed in the peripheral blood. Bone marrow smear revealed normocellular marrow with normal presence of erythroid cells. Anti-human parvovirus B19 IgM and IgG antibody was positive in the serum on admission. The DNA of the virus was also detected in the peripheral blood by PCR assay. Thus, this case was diagnosed as acute aplastic crisis caused by human parvovirus B19 infection. Blood transfusion was performed on day 1 and day 2. The symptoms gradually disappeared and increase in reticulocyte (11.5%) was observed on day 5. Premature leukocytes in the peripheral blood disappeared on day 2. She recovered from anemia and was discharged on day 7.