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.
The Std Chlamydia. Definition: Chlamydia is a sexually transmitted disease caused by the bacteria Chlamydia trachomatis. The family of Chlamydia viruses has three members that normally affect human beings, but only C. trachomatis produces genital infections.his particular bacterial std disease can cause inflammation of the urethra, cervix, fallopian tubes, rectum or pharnyx (throat) in women, and urethra, prostate, rectum and pharnyx in men.