CSF, Cerebrospinal Fluid; WBCs, White Blood Cells; RBCs, Red Blood Cells; HSV PCR, Herpes Simplex Virus Polymerase Chain Reaction; VZV PCR, Varicella Zoster Virus Polymerase Chain Reaction; IgM, Immunoglobulin M; IgG, Immunoglobulin G; VDRL, Venereal Disease Research Laboratory; PMNs, Polymorphonuclear Leukocytes. This evidence concerns the gene CD40LG and sexually transmitted disease.