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.
Chlamydia has long plagued humanity as the most commonly contracted STD, caused by Chlamydia trachomatis. With the sequencing of the C. trachomatis genome, our ability of understand, diagnose, and combat the pathogen is greatly increased.