Figure 1. Changes in leukocyte count (solid circles), platelet count (solid squares), and serum antibodies tests for Human herpesvirus 6 (HHV-6), Herpes simplex virus (HSV), cytomegalovirus (CMV), and Epstein-Barr virus (EBV) after admission. Values in the box demonstrate immunoreactivity to HHV6, HSV, CMV, and EBV. aHHV-6B was isolated from peripheral blood mononuclear cells on day 5 after admission. bPancytopenia was diagnosed on the day 14 after admission. IgG = immunoglobulin G; G-CSF = granulocyte-colony stimulating factor (G-CSF).