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.Nationally reported chlamydia rates have increased each year since 1997, resulting in a relative increase of 72% between 2001 (161.4 per 100,000) and 2010 (277.6 per 100,000). In 2010, 94,690 cases of chlamydia infection were reported in Canada.Most commonly prescribed antibiotics for chlamydia are azithromycin and doxycycline.