Chlamydia is a sexually transmitted disease caused by the bacteria Chlamydia trachomatis, which infects the genital tract of both men and women. Like most other STD's, Chlamydia responds well to antibiotics and is easily treated. However, the symptoms of the disease are often very mild and many people are not aware that they have it. As such, people at risk for the disease, or at risk for compilations, should be tested for it about once a year. This includes sexually active females under the age of 24, pregnant women, and anyone who engages in frequent unprotected sex.