There are many species of genus Chlamydia which causes human diseases, but this genus causing diseases in humans like as Chlamydia trachomatis and other species are C. pneumoniae that is a human pathogen, C. psittaci causes psittacosis in avian but causes infection in humans as zoonosis case, the transmission is rare inperson to person transfer. In women, this leads to severe genital infections like pelvic inflammatory disease, tubal infertility, infertility, ectopic pregnancy, and chronic pelvic pain. The high risk of this infection is usually at a young age. Symptoms are; the burning sensation while urinating or abnormal vaginal discharge, lower abdominal pain, nausea, lower back pain, pain during sex, fever, and pain while passing urine,etc. Different types of tests are used to diagnose the infection. Prevention for reduces infection, the use of a condom, number of sex partners will be limited, going to the laboratory regularly for screening. Medicines that are taking against infection are quinolone and tetracycline, erythromycin, clarithromycin, ampicillin, etc.