Serologic test results revealed a positive EBV infection (EBV viral capsid antigen (EBV-VCA) IgM-positive, EBV-VCA IgG-positive, EBV nuclear antigen (EBNA) Ig G-positive, and EBV early antigen (EA) IgM-positive). Here, CD40LG is linked to Epstein-Barr virus infection.