Most people who have chlamydia don't know it since the disease often has no symptoms.

Photo of a woman reading a fact sheet.

Women under 25 and older women with risk factors need testing every year.

Illustration of people abstracted behind a bar graph.

Chlamydia is the most commonly reported bacterial STI in the United States.

Photo of a clinician and her patient.

Chlamydia is easily cured but can make it difficult to get pregnant if left untreated.


STI Prevalence, Incidence, and Cost Estimates in the United States: 1 in 5 people in the United States had an STI on any given day in 2018. These updated estimates provide the clearest picture to date of how common and costly STIs are in the United States. (January 25, 2021)

The State of STDs in the United States: This infographic highlights statistics for the three reportable STDs, as well as the populations most affected by these diseases, consequences of untreated STDs, and ways to prevent them. (April 13, 2019)

EPT Success Storypdf icon

Innovative STD Prevention Campaigns Success Storypdf icon

De-Duplication Guidance for Gonorrhea and Chlamydia Laboratory Reportspdf icon – This document contains background and guidance on the timeframe that jurisdictions should use to de-duplicate their gonorrhea and chlamydia laboratory reports before reporting these cases to CDC. (June 17, 2016)

2015 STD Treatment Guidelines – Chlamydial Infections – Includes diagnosis, treatment, prevention, and special considerations for chlamydial infections. Includes updated screening recommendations. (June 4, 2015)

Prevalence of Chlamydia trachomatis Genital Infection Among Persons Aged 14–39 Years — United States, 2007–2012 – MMWR September 26, 2014

Recommendations for the Laboratory-Based Detection of Chlamydia trachomatis and Neisseria gonorrhoeae — 2014 (March 14, 2014)