HSV1/2: herpes simplex virus type 1/2; VZV: varicella-zoster virus; CMV: cytomegalovirus; PHA: phytohemagglutinin; HIV: human immunodeficiency virus; ANA: anti-nuclear antibody; STS: serologic test for syphilis; TP: Treponema pallidum; HBS Ag: hepatitis B surface antigen; s/co: (value of specimen/cut-off value); HCV Ab: hepatitis C virus antibody; CH50: 50% hemolytic complement activity; IL2-R: interleukin-2 receptor; CLIA: chemiluminescent immunoassay; -: not tested. This evidence concerns the gene IL2RA and syphilis.