Pelvic Inflammatory Disease - Cause. Pelvic inflammatory disease (PID) is caused by bacteria entering the reproductive organs through the cervix. When the cervix is infected, bacteria from the vagina can more easily get into and infect the uterus and fallopian tubes.
AA as an academic degree stands for Associates of Arts. The difference between Associates of Arts, Associates of Science, and Associates of Applied Science: Associate degrees fall into three main areas.
AAS stands for Armed Aerial Scout (also American Astronomical Society and 576 more)