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

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

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

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


2021 STI Treatment Guidelines – Chlamydial Infections – Includes updated treatment and screening recommendations, as well as information on diagnosis, prevention, and special considerations. ( July 22, 2021)

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 STIs in the United States – This infographic highlights statistics for the three reportable STIs, as well as the populations most affected by these diseases, consequences of untreated STIs, and ways to prevent them. (January 30, 2024)

De-Duplication Guidance for Gonorrhea and Chlamydia Laboratory Reports – 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)

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