RESUMO
Chlamydia trachomatis (CT) infection is often silent and can lead to long-term reproductive complications in women. In this study, we determined the prevalence of CT infection and possible associations between the presence of the infection and clinical-epidemiological variables in pregnant women attended at the Basic Health Units of the Coari city, Amazonas, Brazil. From July 2016 to March 2017, 164 pregnant women undergoing prenatal care were recruited. One hundred of these women were tested for CT infection using two types of samples: cervico-vaginal and urine. The diagnosis was confirmed by PCR with primers specific for the omp1 gene of CT chromosomal DNA. Of the 100 pregnant women, 18 (18%) had CT infection, 8 (8%) of which were positive in both samples, 7 (7%) only in the urine sample and 3 (3%) only in cervical-vaginal sample. There was moderate agreement (Kappa=0.55) and no statistically significant difference between sample types (p = 0.400). The mean age of infected women was 21.1 years (SD = 4.6). Of the clinical-epidemiological variables analyzed, "more than 2 partners in the last 12 months" (p = 0.022) and gynecological complaint of "pain after intercourse" (p = 0.020) were associated with CT infection. This study showed a high prevalence (18%) of CT infection among pregnant women in Coari / Amazonas. Urine sampales were as good as cervical-vaginal ones for the screening of CT infection during the prenatal period.