CD40LG and syphilis: Serologic results for Toxoplasma gondii (IgA, IgM, IgG), Toxocara (IgG), Leptospira (combined IgM/IgG), syphilis (treponemal and non-treponemal test), zika virus (IgM, IgG), cytomegalovirus (CMV) (IgM, IgG), herpes simplex virus (HSV) (IgM, IgG), varicella zoster virus (VZV) (IgM, IgG) and human immunodeficiency virus (p24 antigen and HIV-1 and HIV-2 antibodies) were negative.