Region I Infertility Prevention Project

Epidemiology and Statistics

Chlamydia remains the most commonly reported infectious disease in the United States. In 2006, 1,030,911 chlamydia diagnoses were reported, up from 976,445 in 2005. Even so, most chlamydia cases go undiagnosed. It is estimated that there are approximately 3 million new cases of chlamydia in the United States each year. The national rate of reported chlamydia in 2006 was 347.8 cases per 100,000 population, an increase of 5.6 percent from 2005 (329.4). The increases in reported cases and rates likely reflect the continued expansion of screening efforts and increased use of more sensitive diagnostic tests; however, the continued increases may also reflect an actual increase in infections (CDC 2006).

Women, especially young women, are hit hardest by chlamydia. Studies have found that chlamydia is more common among adolescent females than adolescent males, and the long-term consequences of untreated disease are much more severe for females.  Young females aged 15 to 19 had the highest chlamydia rate (2,862.7), followed by females aged 20 to 24 (2,797.0). Chlamydia is common among all races and ethnic groups; however, African-American women are disproportionately affected. In 2006, the rate of reported chlamydia per 100,000 Black females (1,760.9) was more than seven times that of White females (237.0) and more than twice that of Hispanic females (761.3) (CDC 2006).

National Data

Regional Data

State Data


From 1995-2012, JSI Research & Training Institute, Inc. successfully served as the coordinator of the Region I Infertility Prevention Project (IPP). Further information about the Region I Infertility Prevention Project can be obtained on