The results of viral screening were negative for hepatitis B (hepatitis B surface antigen, anti-hepatitis B core antibody), hepatitis C (anti-hepatitis C virus), human immunodeficiency virus (anti-HIV-I/II), cytomegalovirus (immunoglobulin G [IgG]-positive and IgM-negative), and Epstein-Barr virus. Here, CD40LG is linked to hepatitis A virus infection.