Chlamydia infection is a common sexually transmitted infection in humans caused by the bacterium Chlamydia trachomatis. Chlamydia is a major infectious cause of human genital and eye disease. Chlamydia infection is one of the most common sexually transmitted infections worldwide. Chlamydia can be transmitted during vaginal, anal, or oral sex, and can be passed from an infected mother to her baby during childbirth.n recent years techniques like Nucleic acid amplification tests (NAAT), such as polymerase chain reaction (PCR), transcription mediated amplification (TMA), and the DNA strand displacement amplification (SDA) are used to identify chlamydia. Because these methods identifies the bacterial genetic material, it is a fast way to diagnose compared with the traditional culture method, which is very time consuming. The sample for these tests can be self-collected by patients with swabs or through urine test.