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 is an important cause of sexually transmitted diseases, including trachoma, pelvic inflammatory disease, and cervicitis. C trachomatis can also cause pneumonia, primarily in infants and young children. trachomatis is an important cause of sexually transmitted diseases, including trachoma, pelvic inflammatory disease, and cervicitis. C trachomatis can also cause pneumonia, primarily in infants and young children.