Abstract
Background: Key populations - men who have sex with men (MSM), female sex workers (FSW) and people who inject drugs (PWID) – are at high risk for STI infection given their sexual risk behaviours along with social, legal and structural barriers to prevention, care and treatment services. The purpose of this secondary analysis is to assess the prevalence of self-reported STIs among participations of the first Biological Behavioural Surveillance (BBS) in Mozambique and to describe associated risk factors.Methods: Responses from the first BBS surveys conducted in 2011-2014 were aggregated across survey-cities to produce pooled estimates for each population. Aggregate RDS-weighted estimates were computed to analyse self-reported STI prevalence. Unweighted pooled estimates were used in multivariable logistic regression to identify associated risk factors. Results: The prevalence of self-reported STI was 11.9% (95% CI: 7.8-16.0), 33.6% (95% CI: 29.0-41.3), and 22.0% (95% CI: 17.0-27.0) among MSM, FSW and PWID, respectively. MSM who were circumcised, had HIV, reported drug use, reported receptive anal sex, and non-condom use with their last male partner had greater odds of STI self-report. STI-self report among FSW was associated with living in Beira, being married, employment aside from sex work, physical violence, sexual violence, drug use, access to comprehensive HIV prevention services, non-condom use with last client, and sexual relationship with a non-client romantic partner. Among PWID, risk factors for self-reported STI infection included living in Nampula, access to HIV prevention services, and sex work.Conclusion: The high-burden of STIs among survey participants requires integrated HIV and STI prevention, treatment, and harm reduction services that address overlapping risk behaviours, especially injection drug use and sex work. A robust public health response requires the creation of a national STI surveillance system for better screening and diagnostic procedures within these vulnerable populations.