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4; 95% CI = 1.4-8.6; increase per category from less then 1/month, ≥ 1/month but less then 1/week, to ≥ 1/week) and no or inconsistent condom use during anal or oral sex (OR = 3.0; 95% CI = 1.1-8.3; increase per category from using every time, occasionally, to never), adjusted for residency and time between visits. Discussion Modifiable behaviours were associated with incident syphilis, and dissemination of prevention messages are needed. (c) 2019 The authors; licensee World Health Organization.The purpose of this study was to investig