Chlamydia - How common is chlamydia?
BMJ Group Medical Reference
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 in the UK chlamydia is the most common infection to be passed on during sex. There were 217,570 new cases diagnosed during 2009. We also know that chlamydia is getting more common.
A UK screening programme offers chlamydia testing to people between 15 and 24. About 7 in 100 people tested have chlamydia.
You get an infection when bacteria, a fungus, or a virus get into a part of your body where it shouldn't be. For example, an infection in your nose and airways causes the common cold. An infection in your skin can cause rashes such as athlete's foot. The organisms that cause infections are so tiny that you can't see them without a microscope.
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