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 (C. trachomatis) is a bacterium, and C.trachomatis infection is the most common sexually transmitted infection (STI). Both men and women can get chlamydia. When left untreated, chlamydia can cause: 1  Damage to the sex organs.2  Sterility (the inability to have children).bout half of the women with chlamydia do not have symptoms. When symptoms are present, they may include: 1  White, yellow or green discharge (fluid) from the vagina that may have a bad smell. 2  Bleeding between periods. 3  Itching or burning in or around the vagina. 4  Dull pain in the lower abdomen or pelvis.