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It is a common STI caused by the bacterium Chlamydia trachomatis.

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Chlamydia under a microscope.

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Chlamydia produces no symptoms in most people. If symptoms do occur, it may not be noticeable until several weeks after exposure. Symptoms may include: painful urination, pain in the pelvic region and testes, and vaginal or penile discharge.

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Chlamydia can be transmitted through vaginal, oral, or anal intercourse.

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Untreated chlamydia in women can spread into the uterus and uterine tubes and cause pelvic inflammatory disease. PID scars the uterine tubes, which may prevent fertilization by completely blocking sperm. This may result in infertility, or partially block the uterine tube, preventing a fertilized ovum from moving into the uterus and causing it to implant in the uterine tube.

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Newborns may become infected in the birth canal, and as a result develop respiratory tract infections and a form of conjunctivitis, trachoma, which can lead to blindness.

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Chlamydia can be easily treated with antibiotics.