CD40LG and Pancytopenia: Eight days after the end of the treatment, the pancytopenia had disappeared (leucocytes 7500 cells/mm3, hemoglobin 102 g/L, and thrombocytes 174 cells/mm3), serum IgG and IgM against B19V were present, and the B19V viral load was 3 log lower (537 × 103/mL).