Chlamydia trachomatis load at matched anatomic sites: implications for screening strategies

Area of Science:

• Microbiology
• Infectious Diseases
• Urogenital Health

Background:

• Chlamydia trachomatis is a common cause of urogenital infections.
• Various sample types, including swabs and urine, are used for diagnosis.
• Understanding organism load across different sample types is crucial for accurate diagnosis.

Purpose of the Study:

• To determine Chlamydia trachomatis organism load in matched specimens from different anatomic sites.
• To examine the relationship between organism load and clinical signs/symptoms in men and women.
• To evaluate the suitability of noninvasive sample types for Chlamydia trachomatis detection.

Main Methods:

• Analysis of organism load using ligase chain reaction or real-time PCR assays.
• Comparison of organism loads in first-void urine (FVU), urethral swabs, endocervical swabs, and self-collected vaginal swabs (SCVSs).
• Correlation of organism load with reported symptoms and clinical signs.

Main Results:

• In men, organism loads in FVU and urethral swabs were comparable and associated with symptoms/signs.
• In women, organism loads varied significantly: endocervical swabs > SCVSs > urethral swabs > FVU.
• Higher organism loads in SCVSs compared to FVU in women.
• Only multiple symptoms/signs correlated with organism load in women.

Conclusions:

• First-void urine (FVU) is a suitable noninvasive sample for diagnosing Chlamydia trachomatis in men.
• Self-collected vaginal swabs (SCVSs) are the preferred noninvasive sample for women due to higher organism loads compared to FVU.
• Sample type selection can impact diagnostic accuracy and clinical correlation in Chlamydia trachomatis infections.