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POPSChlamydia Lab Test Chlamydia is a common sexually transmitted disease caused by the bacteria Chlamydia trachomatis. When transmitted through sexual contact, the bacteria can infect the urinary and reproductive organs. Chlamydia is also known as “Silent disease” because in many cases do not have any symptoms. This infection is easily spread because it often causes no symptoms and may be unknowingly passed to sexual partners. In fact, about 75% of infections in women and 50% in men are without symptoms.