[The role of serum IgG antibody of Chlamydia trachomatis in urogenital tract diseases].

In the present study, the frequency of antigen and the titer of serum IgG antibody for Chlamydia trachomatis in non-gonococcal urethritis and prostatitis and the variation in the titer of serum IgG antibody were investigated. The frequency of antigen for C. trachomatis was 44.4% in men with non-gonococcal urethritis and 9.1% in those with prostatitis. The serum IgG antibody was found in 59.3% of the men with non-gonococcal urethritis and in 54.5% of the men with prostatitis. There was a high change to show positive serum IgG antibody in patients with non-gonococcal urethritis of positive antigen for C. trachomatis. The variation makes the titer of serum IgG antibody a poor index of the therapy of C. trachomatis.