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Chlamydia is a common STI caused by bacterium Chlamydia trachomatis. It is easily treated, but 3 million infections occur annually in the United States. Sometimes symptoms do not occur, but if they do they may not appear until several weeks after exposure. Most commonly include painful urination, pain in the pelvic region and testes, and vaginal or penile discharge. Newborns may become infected in the birth canal. Women who go with untreated chlamydia can spread into uterus and uterine tubes and cause Pelvic Inflammatory Disease, which scars uterine tubes. The recommended prevention is abstinence from sexual activity. Antibiotic therapy for the affected patient and the patient's sexual partners is recommended. There are several medications that can be taken to treat chlamydia, them being, Azithromycin, Doxycycline, Tetracycline, Erythromycin, and Ofloxacin.