Genital chlamydial infection is a sexually transmitted disease (STD) of public health importance. Infection with Chlamydia trachomatis can cause urethritis, cervicitis, pharyngitis, or epididymitis, although asymptomatic infections are quite common. Chlamydial infection remains asymptomatic in approximately 50% of infected men and 70% of infected women. Genital infection with C. trachomatis markedly enhances the risk for reproductive tract sequelae in women, including tubal factor infertility and ectopic pregnancy. A proper detection of C. trachomatis and its treatment is of importance to prevent outbreaks of genital chlamydial infection. We review the pathology, diagnosis and treatment of this entity.