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.
Chlamydia trachomatis. By Ashley Wiser. Chlamydia, also known as the silent STI due to its lack of symptoms in infected individuals, is a bacterial infection caused by Chlamydia trachomatis (1). Chlamydia trachomatis is an intracellular parasite that survives within targets cells of mucous membrane. Mucous membranes that are susceptible to infection include surfaces of the urethra, vagina, cervix, and endometrium, fallopian tubes, anus, rectum, eyelid, and throat (2) .