A serosurvey of Haemophilus ducreyi, syphilis, and herpes simplex virus type 2 and their association with human immunodeficiency virus among female sex workers in Lagos, Nigeria.

Cross-sectional standard serologic assays were used to determine the prevalence of Haemophilus ducreyi Treponema pallidum and herpes simplex virus type 2 (HSV-2) antibodies among 796 female commercial sex workers from Lagos Nigeria and their association with HIV antibody status. The seroprevalence rates were 86% for anti-H. ducreyi IgG and 69% for anti-H. ducreyi IgA 4% for rapid plasma reagin and Treponema palladium hemagglutination assay confirmed syphilis 59% for HSV-2 12% for HIV-1 and 2% for HIV-2. Lower-class sex workers were significantly more likely than upper-class sex workers to be H. ducreyi-positive and to have current or past syphilis infection. The presence of syphilis increased significantly with older age. Non-Nigerian sex workers had significantly higher reactivity to chancroid and borderline reactivity to syphilis. A history of sex with non-Nigerian Africans was significantly associated with chancroid reactivity and borderline significant with syphilis serostatus. H. ducreyi seropositivity was significantly more likely in female sex workers with HSV-2 and syphilis. Chancroid and HSV-2 antibodies were also more common in HIV-infected sex workers. The high prevalence of H. ducreyi antibodies detected in this study underscores the importance of an effective program to control genital ulcerative disease as part of the strategy to prevent the spread of HIV in Nigeria.