Prevalence of Chlamydia trachomatis infection among men screened in 4 U.S. cities

Sex Transm Dis. 2005 Feb;32(2):74-7. doi: 10.1097/


Objective: The objective of this study was to measure the prevalence of Chlamydia trachomatis (CT) infection among men in clinical and nonclinical settings across the United States.

Goal: The goal of this study was to obtain data to inform recommendations regarding male CT screening.

Study: The authors conducted a cross-sectional study of CT prevalence among adolescent and adult men in 4 U.S. cities (Baltimore, Denver, San Francisco, and Seattle). CT was detected using urine-based testing, and prevalence was calculated for first testing event.

Results: Over 23,000 men were tested for CT over a 3 1/2-year period. The majority (96%) were asymptomatic. Overall, prevalence was 7% and varied significantly between cities (range: Seattle, 1%; Baltimore, 12%), by age (peak prevalence at age 20-24 years, 9%), and between venues where CT testing was offered.

Conclusions: At 7%, the prevalence of CT is moderately high among men opportunistically tested in nonclinical and clinical settings.

Publication types

  • Multicenter Study
  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Adolescent
  • Adult
  • Chlamydia Infections / epidemiology*
  • Chlamydia Infections / etiology
  • Chlamydia trachomatis*
  • Cross-Sectional Studies
  • Humans
  • Male
  • Mass Screening
  • Prevalence
  • United States / epidemiology
  • Urban Health