History and Objectives: Considering the incidence of Chlamydia trachomatis and its known complications and costly diagnostic methods needing especial facilities, this study was carried out to determine its prevalence among patients with pelvic inflammatory disorders.

Materials and Methods: The descriptive strategy of this study was conducted on 323 cases. After a diagnosis of PID on the basis of medical history and clinical examination, samples were collected from endocervix by a swab and tested by fluorescent antibody direct method. In addition, information on age, multiparous status, contraceptive method and so on was collected through arranging interview. At last, the prevalence was calculated for the society.

Results: A total of 323 women with PID were studied in whom only 33 cases (10.2%) showed chlamydial infection. There was an inverse relationship between prevalence and the factors increased age, age of intercourse engagement, number of intercourse/week and knowledge level. There was also a lower rate of prevalence when using condom and/or contraceptive pill and coitus interruptus increased the incidence rate. In addition, patients with PID showed a higher rate of dysmenorrhea and dyspareunia and there was no significant relationship between infection and uterine bleeding and/or dysuira. Patients with cervical hypertrophy showed a higher rate of PID.

Conclusion: prevalence of Chlamydia trachomatis is not high in PID. Nonetheless, because of its complications, it is necessary to conduct studies on its causative factors and to lower its incidence.