1. High Prevalence of Sexually Transmitted Infections and Poor Sensitivity and Specificity of Screening Algorithms for Chlamydia and Gonorrhea Among Female Sex Workers in Zimbabwe: Analysis of Respondent-Driven Sampling Surveys in 3 Communities.
- Author
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Chabata ST, Fearon E, Musemburi S, Machingura F, Machiha A, Hargreaves JR, Ndowa FJ, Mugurungi O, Cowan FM, and Steen R
- Subjects
- Humans, Female, Zimbabwe epidemiology, Prevalence, Adult, Young Adult, Adolescent, Surveys and Questionnaires, Syphilis diagnosis, Syphilis epidemiology, Sex Workers statistics & numerical data, Gonorrhea diagnosis, Gonorrhea epidemiology, Algorithms, Chlamydia Infections diagnosis, Chlamydia Infections epidemiology, Sensitivity and Specificity, Mass Screening methods, Sexually Transmitted Diseases diagnosis, Sexually Transmitted Diseases epidemiology
- Abstract
Background: Effective strategies to reduce sexually transmitted infection burden and transmission among female sex workers (FSWs) and their networks are needed. We report sexually transmitted infection prevalence among FSWs in Zimbabwe and investigate the performance of screening algorithms., Methods: Respondent-driven sampling (RDS) surveys, including blood sampling for syphilis serology, were conducted among FSWs in 3 communities in Zimbabwe in 2017. In addition, a random sample of one-third of participants were offered genital examination and sexually transmitted infection (STI) testing. Data on symptoms and clinical signs were analyzed to determine the proportion of asymptomatic and clinically inapparent STIs by HIV status, and the sensitivity, specificity, and predictive values of syndromic, clinical, and hybrid screening algorithms for chlamydia and gonorrhea. Analyses were RDS-II weighted., Results: Overall, 2507 women were included in the RDS surveys, and 661 of 836 (79.1%) of those randomly offered genital examination and STI testing accepted. The prevalence of STI by site ranged from 15.7% to 20.0% for syphilis (rapid plasma reagin + Treponema pallidum hemagglutination assay), 6.8% to 14.3% for gonorrhea, 8.4% to 10.1% for chlamydia, 26.6% to 35.5% for trichomonas, and 37.0% to 47.6% for any high-risk human papilloma virus. A high proportion of infections were both asymptomatic and clinically undetectable (gonorrhea: 41.2%, chlamydia: 51.7%, trichomonas: 62.8%). Screening algorithms performed poorly whether based on symptoms only (sensitivity: 53.3% gonorrhea, 43.3% chlamydia) or either symptoms or clinical signs (sensitivity: 58.7% gonorrhea, 48.3% chlamydia)., Conclusions: Sexually transmitted infection burden is high among FSWs in Zimbabwe. The low sensitivity and specificity of screening algorithms used to guide syndromic management mean that more effective approaches are required to strengthen STI control. As access to HIV-specific prevention methods like preexposure prophylaxis increases, support for consistent condom use needs to be strengthened., Competing Interests: Conflict of Interest and Sources of Funding: This research was funded in whole or in part by the President's Emergency Plan for AIDS Relief (PEPFAR) through the Centers for Disease Control and Prevention (CDC) under the terms of grant no. 1U2GPS003118-05-03 between CDC and RTI to support the implementation of the Building Health Data Dissemination and Information Use Systems in the Republic of Zimbabwe under the President's Emergency Place for AIDS Relief Activities, and by the Wellcome Trust (grant no. 214280/Z/18/Z). The authors declare no competing interests., (Copyright © 2024 The Author(s). Published by Wolters Kluwer Health, Inc. on behalf of the American Sexually Transmitted Diseases Association.)
- Published
- 2025
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