title: Letter: Anergy in patients with syphilis.
mesh_terms: D006566:Herpesviridae Infections / Q000276:immunology; D006801:Humans; D006967:Hypersensitivity; D007111:Immunity, Cellular; D007244:Infectious Mononucleosis / Q000276:immunology; D008213:Lymphocyte Activation; D013587:Syphilis / Q000276:immunology*; D014208:Treponema / Q000276:immunology; D014210:Treponema pallidum / Q000276:immunology