CD40LG and systemic lupus erythematosus: Infectious diseases (HBsAg, Anti-HCV, TPHA, Anti-HIV 1/ 2 and HIV 1 Ag, Toxocara canis IgG, Toksoplasma gondii IgM/ IgG and PCR for HSV, VZV, CMV) and autoimmune diseases, such as systemic lupus erythematosus (SLE), systemic sclerosis, etc., showed no pathological findings.