The Risk of Transmission of Genital Chlamydia trachomatis Infection Is Less than That of Genital Neisseria gonorrhoeae Infection

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Abstract
A total of 211 men with 237 female sexual partners and 155 women with 156 male consorts were examined for genital infection with C. trachomatis and N. gonorrhoeae. The index patients had single chlamydial or gonococcal infections or dual infections with both microorganisms. Analysis of recovery rates for groups of sexual consorts indicated that gonorrhea was contracted more frequently than chlamydial infection. When index patients had dual infections, 45% and 28% of their female and male consorts, respectively, had chlamydial infection, but 64% and 77%, respectively, had gonorrhea. When index patients had single infections with C. trachomatis or N. gonorrhoeae, chlamydial infections were observed in consorts of 45% (women) and 28% (men), but gonococcal infections were observed in 80% (women) and 81% (men). A significantly larger proportion of consorts of patients with chlamydial infection eluded infection than did partners of patients with gonorrhea. Women who used an intrauterine contraceptive device had chlamydial and gonococcal infections more often than those who used other forms of contraception, or no contraceptive.