[Study on Chlamydia trachomatis antigen detection in first-voided urine sediments].

C. trachomatis antigen in first-voided urine sediments was detected by a new EIA kit using a monoclonal antibody, IDEIA CHLAMYDIA (IDEIA, Novo Nordisk), in males with urethritis and females with cervicitis. The result was compared with that by Chlamydiazyme (Abbott). 1. C. trachomatis antigen detection in male urethritis (285 cases) by the IDEIA test: The antigen detection rate was 37.9% (108/285) in urethral smears, and 33.7% (96/285) in first-voided urine sediments of the patients. The positive co-incidence rate between urethral smears and first-voided urine sediments was 82.4% (98/108). Thus, the detection of the antigen seems feasible in first-voided urine sediments. 2. Comparison of C. trachomatis antigen detection by the IDEIA and Chlamydiazyme tests: In 78 male cases with urethritis undergoing both tests, the rates of antigen detection from urethral smears and first-voided urine sediments were studied. The detection rate from urethral smears was 41.0% (32/78) for IDEIA, and 37.2% (29/78) for Chlamydiazyme. In first-voided urine sediments, the rate was 35.9% (28/78) for IDEIA and 24.4% (19/78) for Chlamydiazyme. In both specimens, the detection sensitivity was higher for IDEIA. 3. C. trachomatis antigen detection in chlamydial cervicitis (28 cases) by the IDEIA test: The antigen detection rate was 46.4% (13/28) in urethral smears and 60.7% (17/28) in first-voided urine sediments. The detection rate in first voided urine sediments was higher. Thus, in patients suspected of having chlamydial cervicitis, it seems necessary not only to search the antigen in cervical smears but also to study the first-voided urine sediments.(ABSTRACT TRUNCATED AT 250 WORDS)