Chlamydia is a curable sexually transmitted disease (STD) that is caused by the Chlamydia trachomatis bacteria. Approximately 2.8 million Americans get the disease each year. Women can get reinfected if their partners are not treated as well. As a result, reinfection can place women at higher risks for serious reproductive health complications, such as infertility. Treatment options for chlamydia usually involve a course of antibiotics.