Ahmadi A, et al. - In order to investigate the association between Chlamydia trachomatis (CT) infections and preterm birth, researchers analyzed all articles published in literature databases including Google Scholar, PubMed, ISI (Web of Science), Biological Abs, IranMedex, SID, and Scopus. Analysis indicated that women with chlamydia infections, compared to those who were not infected, were 2.28 more likely to deliver pre-term suggesting that chlamydia infections increase the risks of preterm delivery.