CD40LG and syphilis: Peripheral blood was negative for the antibody to hepatitis B surface antigen (HBsAg), immunoglobulin M antibody (IgM) to hepatitis B core antigen (anti-HBc), IgM antibody to hepatitis A virus (IgM anti-HAV), hepatitis C virus (HCV), human immunodeficiency virus (HIV), syphilis (VDRL), cytomegalovirus (CMV), Epstein-Barr virus (EBV), brucella and autoantibodies (ANA, AMA, ASMA and LKM1).