"Chlamydiales are a large group of highly related obligate intracellular bacteria that includes the human pathogens Chlamydia trachomatis and Chlamydophila pneumoniae. C. trachomatis is an agent of genital and ocular infections, and Cph. pneumoniae causes atypical pneumonias. All Chlamydiae use a type III secretion (T3S) apparatus to translocate ~ 60-90 effector proteins into host cells. These eff ...