SyphilisChancreSyphilis SerodiagnosisSyphilis, CutaneousTreponema pallidumSyphilis, CongenitalSyphilis, LatentAntitreponemal AgentsEconomic DevelopmentUlcerReaginsPenicillin G BenzathineTreponema Immobilization TestHemagglutination TestsAntibodies, BacterialNeurosyphilisSyphilis, CardiovascularYawsPregnancy Complications, InfectiousSexually Transmitted DiseasesHomosexuality, MalePenicillin G ProcaineGonorrheaFluorescent Treponemal Antibody-Absorption TestHIV Infections