Just 38 percent of sexually active young women were screened for chlamydia in the previous year, according to the most recent nationally representative estimate conducted by the Centers for Disease Control and Prevention. CDC recommends annual screening for all sexually active women aged 25 and under.

Overall testing rates remain low, although testing was most common among African-American women, those who had multiple sex partners, and those who received public insurance or were uninsured. Researchers find this encouraging because these are some of the groups at highest risk for chlamydia.

“This new research makes it clear that we are missing too many opportunities to protect young women from health consequences that can last a lifetime,” said Kevin Fenton, M.D., director of the CDC’s National Center for HIV/AIDS, Viral Hepatitis, STD and TB Prevention. “Annual chlamydia screening can protect young women’s reproductive health now and safeguard it for the future.”

Chlamydia is the most commonly reported infectious disease in the United States, and young people are most affected. Because people often do not have symptoms, many infections go undetected and untreated. Untreated chlamydia can have severe long-term health consequences, particularly for young women, including chronic pelvic pain, potentially fatal ectopic pregnancy and infertility.

CDC recommends that anyone diagnosed with chlamydia be retested three months after initial treatment to ensure that those who may have become reinfected can be promptly treated with antibiotics. However, additional data show that retesting rates remain low and many reinfections likely are being missed. By examining available data on more than 60,000 men and women who tested positive for chlamydia CDC  found that just 14 percent of men and 22 percent of women were retested within 30-180 days. Of those who were retested, a significant proportion again tested positive (25 percent of men and 16 percent of women).

“It is critical that health care providers are not only aware of the importance of testing sexually active young women every year for chlamydia infections, but also of retesting anyone who is diagnosed,” said Gail Bolan, M.D., director of the CDC’s Division of STD Prevention. “Chlamydia can be easily treated and cured with antibiotics, and retesting plays a vital role in preventing serious future health consequences.”