Chlamydia is a disease caused by the bacteria Chlamydia trachomatis. It is most commonly sexually transmitted.
Chlamydia infection is the most common sexually transmitted disease in the United States. Sexually active individuals and individuals with multiple partners are at highest risk.
U.S. Preventive Services Task Force. Screening for Chlamydial Infection. Rockville, MD: Agency for Healthcare Research and Quality; Update to published recommendation: Ann Intern Med. 2007;147:128-134.