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.
Chlamydia is a common sexually transmitted disease (STD) caused by infection with Chlamydia trachomatis. It can cause cervicitis in women and urethritis and proctitis in both men and women.
Back to TopCauses. Trachoma is caused by infection with the bacteria Chlamydia trachomatis . The condition occurs around the world. It is most often seen in rural areas of developing countries. Children are often affected, but the scarring caused by the infection may not be noticed until later in life.