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Chlamydia Trachomatis

Chlamydia is a sexually transmitted disease (STD) caused by a bacterium called Chlamydia trachomatis. It is the most commonly reported communicable disease in Wisconsin.

Health care professionals should go to the Health Care Professionals webpage for information on reporting STDs and other items.

Am I at risk for chlamydia?

If you are having sex, you can get chlamydia. You are at greater risk if you are a:

  • Teenager having sex
  • Person with any STD
  • Person with a sex partner who has an STD
  • Person with more than one sex partner
  • Person with a new sex partner
  • Person using social apps to find sex partners

How can I avoid exposure to this infection?

There are many ways to prevent getting chlamydia and it’s as easy as ABC.

  • Avoid having sex until you feel prepared to protect yourself.
  • Be monogamous or have sex with just one person who only has sex with you and doesn’t have any STDs. You can find out if both of you have an STD, like chlamydia, by getting tested together.
  • Condoms can protect you from getting chlamydia but only where they cover. If you are not using them for oral sex, you can still get chlamydia.

Fact sheets

Learn more about the causes, risk factors, and treatment of chlamydia:

Testing and treatment

Find locations around the state where you can get tested. Many of these locations allow you to get expedited partner therapy (EPT) for your partner.

Last revised February 13, 2023