Bridging Knowledge–Practice Gaps in Syphilis Prevention: A Nationwide, Online Cross-Sectional Survey of Knowledge, Attitudes, Practices, and Policy Acceptance in Saudi Arabia

Introduction: Syphilis is a preventable sexually transmitted infection (STI) with severe health outcomes, yet it is not included in Saudi Arabia’s national premarital and antenatal STI screening programs. This study assessed knowledge, attitudes, and practices (KAP) toward syphilis in Saudi Arabia and identified predictors of acceptance for including syphilis testing in such programs. Methods: A cross-sectional online survey was conducted among 935 participants aged ≥20 years. Data included sociodemographic characteristics and measures of KAP and screening acceptance. Continuous variables were summarized as medians (IQR) and categorical variables as frequencies and percentages, with bivariate and multivariate logistic regression used to identify predictors of screening acceptance. Results: Knowledge and preventive practices were low, while attitudes were predominantly neutral (median attitude score: 34 IQR 32–38). Although intentions for personal testing were low (17%), support for syphilis testing in premarital (60.8%) and antenatal (48.9%) programs was considerable. Employment in the health sector, older age, and positive attitudes predicted acceptance of screening policies. Knowledge and practice showed a weak correlation (r = 0.14), whereas knowledge and attitude were moderately correlated (r = 0.55). Conclusion: KAP toward syphilis is influenced by specific sociodemographic factors. Although acceptance of screening is high at the policy level, individual-level preventive behaviors remain low.