title: Why is the infectious stage of syphilis prolonged?
mesh_terms: D000906:Antibodies; D000936:Antigen-Antibody Complex; D000941:Antigens; D006801:Humans; D006968:Hypersensitivity, Delayed; D007111:Immunity, Cellular; D008212:Lymphocyte Depletion; D012882:Skin Tests; D013587:Syphilis / Q000276:immunology*; D013588:Syphilis Serodiagnosis; D013590:Syphilis, Congenital / Q000175:diagnosis; D013592:Syphilis, Latent / Q000175:diagnosis; D013997:Time Factors
chemical_list: D000906:Antibodies; D000936:Antigen-Antibody Complex; D000941:Antigens