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What Is It?

Chlamydia is a sexually transmitted infection spread by having unprotected sex with someone infected with bacteria called Chlamydia trachomatis. These bacteria are found in the urine and genital secretions of infected people. Chlamydia can affect several areas of the reproductive system, causing urethritis, vaginitis, cervicitis and pelvic inflammatory disease (PID). Chlamydia also can cause eye infections and pneumonia in newborns delivered by mothers who have chlamydia.

Chlamydia is one of the most common sexually transmitted infections. Infections occur most often in unmarried people under age 25 who have had two or more sex partners during the previous year. In women, chlamydia that is not treated can lead to infertility, chronic pelvic pain and tubal pregnancy, in which the fertilized egg implants and grows in the fallopian tube, rather than the uterus.

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From Health A-Z, Harvard Health Publications. Copyright 2007 by the President and Fellows of Harvard College. All rights reserved. Written permission is required to reproduce, in any manner, in whole or in part, the material contained herein. To make a reprint request, contact Harvard Health Publications. Used with permission of StayWell.

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