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There is a high prevalence of genital Chlamydial trachomatis infection in populations. Young women are vulnerable to persistent genital chlamydial infection, which may lead to many serious complications (e.g., infertility). The severity of infection is determined by the virulence of Chlamydia trachomatis, environmental factors, and host susceptibility. The optimal serum marker for screening of persistent genital infection with Chlamydia trachomatis is the combination of its IgG antibody and C-reactive protein, and IgG alone may only serve as the serum marker for previous infection with Chlamydia trachomatis.