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Abstract
Background Chlamydia trachomatis is one of the sexually transmitted pathogens causing reproductive health-threatening diseases worldwide. However, its role in infertility, particularly in asymptomatic individuals, is not yet definitely determined. Methods For the study, electronic databases were searched using the following keywords; ‘Chlamydia trachomatis’, ‘prevalence’, ‘frequency’, ‘fertile’, ‘infertile’, ‘case’, ‘control’, ‘symptomatic’ and ‘asymptomatic’. Finally, after some exclusions, 34 studies (19 fertile–infertile and 15 symptomatic–asymptomatic) from different countries were included in the study and meta-analysis was performed on the data collected. Results Odds ratios (ORs) for urogenital C. trachomatis prevalence in males in the fertile–infertile group, for infertile and fertile individuals, ranged from 1.3–3.7 and in females from 1.04–4.8, and the overall OR for both genders was 2.2 (95% CI). In the symptomatic–asymptomatic group, the overall OR in males and females was 4.9 (95% CI = 1.1–21.7) and 3.3 (95% CI = 1.7–6.3), respectively. In all of the analyses, there were high levels of heterogeneity (I2 >50%, p-value <0.05) and, except for the females in the symptomatic–asymptomatic group, neither Egger’s tests nor Begg’s tests were statistically significant for publication bias. Conclusions C. trachomatis can impact on the potential for fertility and cause clinical manifestations and complications in both males and females. Thus, national programmes for adequate diagnosis, screening and treatment of infected individuals, particularly asymptomatic ones, seem to be necessary.