The authors used the 1999–2002 National Health and Nutrition Examination Survey to measure chlamydia and gonorrhea prevalence
in the United States. Among 6632 respondents age 14 to 39 years, the prevalence of gonorrhea and chlamydia was 0.24% and 2.2%,
respectively. Chlamydia prevalence was highest among women age 14 to 19 years, non-Hispanic black persons, and persons with
a history of gonorrhea infection. Of those with gonorrhea, 46% also had chlamydia. The prevalence of chlamydia was 10-fold
higher than that of gonorrhea. The data underscore the importance of screening young women for chlamydia.