In a rural district, 241 pregnant women were screened for cervical Chlamydia infection. Eleven positive cases were found (4.6%). The infection was observed most frequently among nulliparous women and the diagnosis could not be established clinically. Following treatment, all of the cases became negative. Out of the same population, 162 women were re-examined after delivery. Three were found to be positive (1.9%) which is not any significant reduction in the prevalence. It is concluded that the infection is frequent among pregnant women also outside city environments and that screening at routine control in the second trimester is not effective as the only effort to eliminate C. trachomatis from the pregnant population.