99.4% (618/622), respectively. The prevalence rate by endocervical cell culture and the expanded gold standard were 4.5% and 5-1 %, respectively. Additional urethral cell culture testing revealed a further nine patients positive from this site only, giving a 28% (9/32) increase in the number of patients diagnosed for chlamydia, thus giving an overall prevalence of 6.6% (41/622). Conclusions: The IMx Chlamydia assay is an easy and rapid test to perform, it is cost effective, and shows similar performance to endocervical cell culture in the female population studied and is thus an excellent alternative to culture for the diagnosis of C trachomatis. The study also showed the importance of urethral site sampling in these women, as endocervical testing alone will underestimate the prevalence of chlamydial genital infection. (Genitourin Med 1997;73:498-502)
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