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Sex Work as a Mediator Between Female Gender and Incident HIV Infection Among People Who Inject Drugs in Tijuana, Mexico

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We studied mechanisms driving gender differences in HIV incidence among 651 women and men who inject drugs (PWID) in Tijuana, Mexico, hypothesizing that sex work will mediate the association between female… Click to show full abstract

We studied mechanisms driving gender differences in HIV incidence among 651 women and men who inject drugs (PWID) in Tijuana, Mexico, hypothesizing that sex work will mediate the association between female gender and HIV incidence. Of 43 HIV seroconversions occurring between 2011 and 2018, 8.8% were among females and 5.2% among males. HIV incidence density was significantly higher among females versus males (1.75 per 100 person years [PY], 95% CI 1.16–2.66, vs. 0.95 per 100 PY, 95% CI 0.62–1.47). Factors significantly associated with HIV seroconversion were: sex work (adjusted hazard ratio [aHR] = 2.25, 95% CI 1.05–4.80); methamphetamine injection (aHR = 2.30, 95% CI 1.12–4.73); and methamphetamine and heroin co-injection in the past six months (aHR = 2.26, 95% CI 1.23–4.15). In mediation analyses, sex work mediated a substantial proportion (84.3%) of the association between female gender and HIV incidence. Interventions should target female PWID who engage in sex work to reduce gender-related disparities in HIV incidence. Estudiamos los mecanismos que impulsan las diferencias de género en la incidencia del VIH entre 651 mujeres y hombres que se inyectan drogas (PQID) en Tijuana, México. Nuestra hipótesis es que el trabajo sexual puede ser una variable mediadora entre la asociación del género femenino y la incidencia del VIH. Entre 2011 y 2018 ocurrieron 43 seroconversiones de VIH: 8.8% fueron entre mujeres y 5.2% entre hombres. La densidad de incidencia del VIH fue significativamente mayor entre las mujeres en comparación con los hombres (1.75 por 100 personas años [PY], IC 95% = 1.16–2.66, vs. 0.95 por 100 PY, IC 95% = 0.62–1.47). Los factores con una asociación significativa con la seroconversión del VIH fueron: trabajo sexual (razón de riesgo ajustada [aHR]=2.25, IC 95% = 1.05–4.80); inyección de metanfetamina (aHR=2.30, IC 95% = 1.12–4.73); y la coinyección de metanfetamina y heroína en los últimos seis meses (aHR = 2.26, IC 95% = 1.23–4.15). En los análisis de mediación, el trabajo sexual medió una proporción sustancial (84.3%) de la asociación entre el género femenino y la incidencia del VIH. Intervenciones deben ser dirigidas a las mujeres PQID que participan en el trabajo sexual para reducir la incidencia del VIH relacionada con las disparidades de género.

Keywords: sex work; gender; del vih

Journal Title: AIDS and Behavior
Year Published: 2020

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