Detection of Chlamydia trachomatis in men. Sensitive tests for sensitive urethras

Area of Science:

• Microbiology
• Clinical Diagnostics
• Public Health

Background:

• Chlamydia trachomatis is a leading cause of sexually transmitted infections (STIs).
• Traditional diagnostic methods for C. trachomatis often involve invasive urethral swabbing.
• Patient acceptability and diagnostic sensitivity are key considerations in STI screening.

Purpose of the Study:

• To evaluate the diagnostic value of amplified enzyme-linked immunosorbent assay (ELISA) on first-pass urine samples for detecting Chlamydia trachomatis.
• To compare the sensitivity of urine-based ELISA with the direct fluorescent antibody (DFA) test on urethral smears.
• To assess the clinical utility of urine testing in sexually transmitted disease (STD) clinics.

Main Methods:

• Collected paired urine and urethral samples from 190 men attending an STD clinic.
• Analyzed first-pass urine samples using amplified ELISA (IDEIA).
• Compared urine ELISA results with DFA testing of urethral smears, with confirmatory DFA on urine sediment for discordant results.

Main Results:

• The sensitivity of amplified ELISA using first-pass urine samples was 90% (37/41).
• The sensitivity of the DFA test on urethral samples was 83% (34/41).
• Urine testing demonstrated comparable sensitivity to urethral swabbing.

Conclusions:

• Amplified ELISA on first-pass urine samples is a sensitive method for detecting Chlamydia trachomatis.
• This urine-based approach offers comparable diagnostic accuracy to urethral swabbing.
• Implementing urine testing in STD clinics enhances patient acceptability without compromising C. trachomatis detection sensitivity.