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Sexual Health Center

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CDC: 2 Million in U.S. Have Chlamydia

Rates Highest Among African-Americans, Teens
WebMD Health News

July 17, 2007 -- More than 2 million people in the U.S. are infected with chlamydia and 250,000 have gonorrhea, according to a government prevalence estimate for the two sexually transmitted diseases.

Rates of both STDs were disproportionately high among adolescents and African-Americans and among people who had been previously infected with chlamydia or gonorrhea.

The findings present the most comprehensive snapshot of chlamydia and gonorrhea infection in the U.S. ever reported, CDC medical epidemiologist S. Deblina Datta, MD, tells WebMD.

CDC researchers studied 6,632 people between the ages of 14 and 39 participating in a national health survey from 1999-2002. All the participants provided urine samples, which were tested for the presence of chlamydia and gonorrhea bacteria.

"We confirmed that both chlamydia and gonorrhea still pose significant health risks in the United States and that disparities exist, especially with regard to the prevalence of gonorrhea among whites and blacks," Datta says.

Chlamydia and Gonorrhea Figures

Of the diseases that by law must be reported to government health officials, chlamydia and gonorrhea respectively rank No.1 and No. 2 in incidence.

While symptoms can include painful urination, abdominal pain, and unusual discharge from the vagina or penis, many people with chlamydia or gonorrhea have no symptoms at all.

In women, untreated chlamydia or gonorrhea infection can cause pelvic inflammatory disease, infertility, and pregnancy complications such as low-birth-weight babies, premature birth, and serious infections in newborns.

Treatment with antibiotics is important to prevent these and other complications and avoid spreading the STDS, but many people don't get treated because they don't know they are infected.

According to the newly published CDC estimate, two out of every 100 (2.2%) adolescents and adults under age 40 in the U.S. are infected with chlamydia and just under one in 400 (0.24%) have gonorrhea.

Across all ethnic groups, adolescents and young adults had the highest infection rates and roughly half of those with gonorrhea infections also had chlamydia.

Overall, the prevalence of chlamydia infection was similar among men and women. But the infection rate was roughly four times higher for African-Americans than for whites (6.4% vs. 1.5%) and the disparity was even higher for gonorrhea.

The chlamydia rate was 17% for females who had reported a previous chlamydia or gonorrhea infection within the past year.

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