The difference in the results may be because their sample was larger than our sample, and their results depend on detection of EBV viremia, using the Real-Q EBV Quantification Kit (BioSewoom, Inc., Seoul, Republic of Korea) with 72 copies/mL cut-off value for EBV viremia while we use EBV-VCA IgM in the detection of EBV infection. The gene discussed is CD40LG; the disease is Epstein-Barr virus infection.