What are the signs and symptoms of chlamydia and how prevalent is it?

See below: Chlamydia is often asymptomatic, it may cause burning on urination, discharge from penis or vagina, lower abdominal pain etc. The prevalence varies by popuplation with an overall prevalence of about 25%. See these two sites for more information. http://www.mayoclinic.com/health/chlamydia/ds00173 http://www.Cdc.Gov/std/stats10/chlamydia.Htm.