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The epidemiology of sexually transmitted infections (STIs) is poorly documented in Mayotte especially among pregnant women (PW) and knowledge of determinants that increased STI in the island, and in this particular socio-economic and health situation, is needed. The objectives of this study were to estimate the frequency and risk factors associated with HIV, HBV, and syphilis, to study the HBV vaccination and describe the knowledge, attitudes, beliefs and behaviors related to HIV/AIDS-STIs in PW. A prospective cross-sectional study was conducted among 671 PW followed in Mayotte public prenatal clinic (Protection Maternelle et Infantile (PMI)) services. No case of HIV seropositivity was observed. The prevalence of HBsAg of HBV was 3.4% and of active syphilis was 2.1%, but the prevalence of HBV infection and HBV vaccination was respectively 35.5% and 18.6%. The HBV infection was associated with birthplace (Comoros), behavioral factors and history of STIs. Syphilis was rather associated with lack of education and history of STIs. The HBV vaccination was associated with sociodemographic determinants. The socio-behavioral study showed that there is a good knowledge of HIV/AIDS-STIs in PW despite the practice of some risky sexual behaviors. This work has helped to draw up an update of HIV and STIs, and their determinants among PW in Mayotte, and could lead to the development of prevention methods adapted to this context ; L'épidémiologie des infections sexuellement transmissibles (IST) à Mayotte est peu documentée notamment chez les femmes enceintes (FE) et la connaissance des déterminants favorisants les IST sur l'île dans un contexte socio-économique et sanitaire très particulier est nécessaire. Les objectifs de ce travail étaient d'estimer les fréquences et facteurs de risque associées au VIH, au VHB, et à la syphilis, d'étudier la vaccination anti-VHB et de décrire les connaissances, attitudes, croyances et comportements liées aux VIH/SIDA-IST chez les FE. Une étude transversale prospective a été réalisée auprès ...
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