Facts to Know

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1. In 2002, the highest reported rates of chlamydia were among 15- to 19-year old females and 20- to 24-year old males.

2. Studies have shown that routine chlamydia screening and treatment can significantly reduce the incidence of lower genital tract chlamydia, as well as pelvic inflammatory disease.

3. An estimated 75 percent of infected women and 50 percent of infected men have no symptoms of chlamydia, and the majority of cases go undiagnosed.

4. From 1987 through 2002, reported chlamydia cases rose dramatically-from 50.8 to 296.5 per 100,000 persons. Rather than evidence of an uncontrolled epidemic, this trend mostly reflects increased screening of asymptomatic women and improved reporting.

5. Research has shown that women infected with chlamydia are two to five times more at risk of acquiring HIV than women not infected.

6. It has been estimated that up to 40 percent of women not treated for chlamydia will develop pelvic inflammatory disease (PID). About 20 percent of women with PID may become infertile and 18 percent experience chronic pelvic pain.

7. For the years 1996 through 2002, the Southern region of the United States had the highest reported rates of chlamydia.

8. The rate of chlamydia among African-American women was eight times higher than the rate among Caucasians in 2002, according to the U.S. Centers for Disease Control and Prevention.