Prevalence of syphilis and associated risk factors among human immunodeficiency virus-infected patients at the Lagos University Teaching Hospital Nigeria: A cross-sectional study

Background: Worldwide, there was an estimated 7.1 million new cases of syphilis in 2020, and most of the infections were found in developing countries like Nigeria. The objective of the study was to determine the prevalence and risk factors for syphilis among human immunodeficiency virus (HIV)-infected patients in Lagos. Methods: A cross-sectional study was conducted in an HIV Clinic in Lagos, Nigeria, from April to June 2017 and 385 HIV-infected adult participants 18 years and above were recruited into the study. Structured questionnaires were used to collect data on sociodemographic and risk factors for syphilis. Blood samples were collected from all participants and tested for syphilis using rapid plasma reagin and Treponema pallidum hemagglutination assay test kits. Data were analyzed using SPSS (IBM) V. 20. Bivariate analysis was carried out using Chi-square, Fisher's exact test, and Student's t-test on sociodemographic and risk behavioral factors. Multivariable logistic regression analysis was performed with variables that were significantly associated with syphilis in bivariate analysis. A P < 0.05 was considered to be statistically significant. Results: Out of 388 HIV-infected patients recruited into the study, 262 (67.5%) were female. The mean age was 43.6 +/- 10.1 years, and 137 (35.3%) of them were in the age group of 41-50 years. The prevalence of syphilis in HIV-infected patients was 1.8%. The prevalence of syphilis was significantly higher in males (4.8%) than females (0.4%). The prevalence of syphilis was higher in those with no education or primary school education, and multiple sexual partners were statistically significant in the bivariate analysis but not in the multivariate analysis. Male gender was the only independent risk factor for syphilis, with an odds ratio of 11.79 (95% confidence interval [1.26-106.5], P = 0.03) in multivariate analysis. Conclusion: The prevalence of syphilis in this study was lower than previous work done in other HIV-positive cohorts in Nigeria. Males were more affected significantly in this study. Routine screening and testing for syphilis should be integrated into HIV care, especially in males.