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Background: Adolescents are disproportionally affected by sexuallytransmitted infections (STI). Chlamydia trachomatis (CT) and Trichomonas vaginalis (TV)are the most frequent curable STI in adolescents, causing serious consequencesfor their reproductive health. Therefore, we aimed to determine the prevalenceand incidence of CT and TV, as well as their risk factors in pregnant adolescents from Belem, northern Brazilian Amazon.Methods: This prospective study enrolled 199 adolescents up to 20 weeksof pregnancy. They were scheduled for follow-up visit between 28 and 29 weeksof pregnancy. Sociodemographic and behavioral data were obtained by interview.Cervicovaginal samples were taken to test for TV, CT, Neisseria gonorrhoeae and bacterial vaginosis. Univariate andmultivariate analyses were performed to test the association of prevalent/incidentCT and TV with the variables. Results: Prevalence of cervical CT infection was33.7% (n = 67/ 199), and for trichomoniasis it was 4.0% (n = 8/199). Cervicalectopy increased the risk for prevalent CT (OR, 1.93; 95% CI, 1.01 - 3.70),while having treated vaginal discharge in the past (OR, 0.51; 95% CI, 0.26 - 0.98)and being married (OR, 0.10; 95% CI, 0.01 - 0.83) were protective againstcurrent CT and TV, respectively. Among the 95 (47.7%) adolescents who completedfollow-up, 15 cases of incident CT were identified. Incident CT was associatedwith having a formal or informal job (OR, 28.4; 95% CI, 2.1 - 391.6) andbacterial vaginosis treatment at the baseline (OR, 0.08; 95% CI, 0.01 - 0.69).Conclusion: Prevalence and incidence rates of TV and CT are high in thispopulation devoid of STI routine screening. Treatment of bacterial vaginosismay benefit this population by reducing risk for CT acquisition.

open journal of obstetrics and gynecology

&lt;i&gt;Trichomonas vaginalis&lt;/i&gt; and &lt;i&gt;Chlamydia trachomatis&lt;/i&gt; Prevalence, Incidence and Associated Factors in Pregnant Adolescents from Bel&#233;m City, in the Brazilian Amazon