Chlamydia is the most frequently reported bacterial sexually transmitted disease in the United States. In 2008, 1,210,523 chlamydial infections were reported to CDC from 50 states and the District of Columbia. Under-reporting is substantial because most people with Chlamydia are not aware of their infections and do not seek testing. Also, testing is not often done if patients are treated for their symptoms. An estimated 2,291,000 non-institutionalized U.S. civilians ages 14-39 are infected with C. trachomatis based on the U.S. National Health and Nutrition Examination Survey. Women are frequently re-infected if their sex partners are not treated.