Chlamydia
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How common is chlamydia?

Most people with chlamydia don't know they have it. That's why we can't say exactly how many people are affected.

We do know that chlamydia is the most common infection to be passed on during sex in the United States.
 
 
 
 
 
Source:
Holmes KK, Sparling PF, Mardh PA, et al.
Sexually transmitted diseases.
McGraw-Hill, New York, U.S.A.; 1999.
 
 
 
 
 
1
 
 
 
 
 
Source:
Centers for Disease Control and Prevention.
Sexually Transmitted Disease Surveillance 2005 Supplement, Chlamydia Prevalence Monitoring Project Annual Report 2005.
Available at http://www.cdc.gov/std/Chlamydia2006/default.htm (accessed on 27 October 2008).
 
 
 
 
 
2

In 2006, more than 3 in every 100 American women aged 15 to 19 had chlamydia. It's been getting more common since the mid-1990s. But these figures might be an under-estimate. In some states, more than 1 in 10 women aged under 25 who got tested in family planning clinics had chlamydia.
 
 
 
 
 
Source:
Centers for Disease Control and Prevention.
Sexually Transmitted Disease Surveillance 2005 Supplement, Chlamydia Prevalence Monitoring Project Annual Report 2005.
Available at http://www.cdc.gov/std/Chlamydia2006/default.htm (accessed on 27 October 2008).
 
 
 
 
 
2

Sources for the information on this page:
  1. Holmes KK, Sparling PF, Mardh PA, et al.Sexually transmitted diseases.McGraw-Hill, New York, U.S.A.; 1999.
  2. Centers for Disease Control and Prevention.Sexually Transmitted Disease Surveillance 2005 Supplement, Chlamydia Prevalence Monitoring Project Annual Report 2005.Available at http://www.cdc.gov/std/Chlamydia2006/default.htm (accessed on 27 October 2008).
This information was last updated on Jan 08, 2009
BMJ Group
This information is for educational use only, and is not a substitute for prompt professional medical advice. Readers should always consult a physician or other professional for advice and treatment.
© BMJ Publishing Group Limited 2010. All rights reserved.
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