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We compared the prevalence of antibody to Chlamydia trachomatis among 88 women undergoing an evaluation for infertility and 49 women attending an antenatal clinic. Demographic data regarding sexual behavior were also collected. Eighteen women had tubal infertility and 70 had infertility due to a variety of other reasons. In comparison with women who had other causes for infertility, women with tubal infertility began coitus sooner (17.7 ± 2.2 years vs. 19.5 ± 3.4 years, P<.05) and had more life time sex partners (4.5 vs. 1.33, P< .001). Women with tubal infertility had a higher prevalence of antibody to C. trachomatis (13 of 18) than did women with nontubal causes for infertility (6 of 70, P< .0001) or pregnant women (11 of 49, P = .0003). This high prevalence of antibody to C. trachomatis among women with tubal infertility was independent of sexual experience. By immunoblot analysis, an antigen of ∼57 …