History of Assisted Reproductive Technology and Chlamydia Trachomatis Infection in Pregnancy.

BACKGROUND AND METHODS To identify whether or not a history of assisted reproductive technology (ART) is associated with the low incidence of Chlamydia trachomatis (CT) infection in pregnant women, we reviewed the obstetric records of the Japanese women aged 35 - 42 years. RESULTS The prevalence of CT in the pregnancies without ART was 1.1% (28/2,632) using nucleic acid amplification tests, while it was zero in the pregnancies conceived by ART (0/364, P = 0.049 by the X(2) test). CONCLUSIONS A history of ART seemed to be a negative risk factor for CT infection in pregnant women.