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Reliable, easy-to-read patient information on common medical conditions — written in plain language, free of jargon, and grounded in current evidence. Browse the most frequent diagnoses, understand what they mean for everyday life, and learn which steps and questions help you have a focused conversation with your doctor.

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Chlamydia infection epidemiology and demographics

Introduction

Overview

Overview

Worldwide, the incidence of chlamydia is estimated to be 131 million cases per year.[1] In 2014, the incidence of chlamydia was estimated to be 439 cases per 100,000 individuals in the United States.[2] The incidence of chlamydia in women has increased greatly between 1987 and 2003, from 79 to 467 cases per 100,000 individuals.[3] Almost two-thirds of new chlamydia infections occur among youth aged 15-24 years. It is estimated that 1 in 20 sexually active young women aged 14-24 years has chlamydia.[2] Females are more commonly affected with chlamydia infection than males. The female to male ratio is approximately 1.52 to 1.[4] The prevalence of chlamydia among non-Hispanic African Americans is 6.7 times the prevalence among non-Hispanic Whites.[2]

Epidemiology

Epidemiology

Incidence

  • Worldwide, the incidence of chlamydia is estimated to be 131 million cases per year.[1]
  • In 2014, the incidence of chlamydia was estimated to be 439 cases per 100,000 individuals in the United States.[2]
  • The incidence of chlamydia in women has increased greatly between 1987 and 2003, from 79 to 467 cases per 100,000 individuals.[3]

Prevalence

  • In 2008, the prevalence of chlamydia in the adult population worldwide was estimated to be 9.1 million cases per year.
  • It is estimated that 1 in 20 sexually active young women aged 14-19 years has chlamydia.[2]
Demographics

Demographics

Age

  • Almost two-thirds of new chlamydia infections occur among youth aged 15-24 years.
  • It is estimated that 1 in 20 sexually active young women aged 14-24 years has chlamydia.[2]

Gender

  • Females are more commonly affected with chlamydia infection than males.
  • The female to male ratio is approximately 1.52 to 1.[4]

Race

  • The prevalence of chlamydia among non-Hispanic African Americans is 6.7 times the prevalence among non-Hispanic Whites.[2]
References

References

  1. ↑ 1.0 1.1 WHO epidemiology http://www.who.int/mediacentre/factsheets/fs110/en/ (2016) Accessed on September 8, 2016
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 Chlamydia CDC Fact Sheet. CDC.http://www.cdc.gov/std/chlamydia/stdfact-chlamydia-detailed.htm#_ENREF_3. Accessed on December 29, 2015
  3. ↑ 3.0 3.1 Miller KE (2006). “Diagnosis and treatment of Chlamydia trachomatis infection”. Am Fam Physician. 73 (8): 1411–6. PMID 16669564.
  4. ↑ 4.0 4.1 Chlamydia Infection. Wikipedia.https://en.wikipedia.org/wiki/Chlamydia_infection#cite_note-LancetEpi2012-26. Accessed on December 29, 2015

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Maliha Shakil, M.D. [2], Aysha Anwar, M.B.B.S[3]