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Chlamydia is a common sexually transmitted infection caused by a bacterium called Chlamydia trachomatis. Infection is often without symptoms, and if not treated, can cause serious reproductive health problems such as pelvic inflammatory disease (PID) and infertility. Chlamydia also can cause infections in newborn babies. Tests and effective treatments are available.

Last modified on: 10/22/2015 3:10 PM