Menstruation, periodic discharge from the vagina of blood, secretions, and disintegrating mucous membrane that had lined the uterus. 1  The biological significance of the process in humans can best be explained by reference to the reproductive function in other mammals.
Chlamydial (kla-MID-ee-al) infections are caused by three species of microorganisms. Chlamydia trachomatis can cause eye or lung infections and can also infect the urinary and genital areas of both men and women. Chlamydia pneumoniae causes infections of the respiratory tract, and Chlamydia psittaci causes an illness, known as parrot fever, that is similar to the flu.
C. trachomatis also causes a form of blindness known as trachoma, but the sexually transmitted disease causes Chlamydia urethritis in men and cervicitis in women. It is transmitted through infected secretions, and mainly infects mucosal membranes, particularly the cervix, rectum and urethra.. trachomatis also causes a form of blindness known as trachoma, but the sexually transmitted disease causes Chlamydia urethritis in men and cervicitis in women. It is transmitted through infected secretions, and mainly infects mucosal membranes, particularly the cervix, rectum and urethra.