Chlamydia trachomatis:A bacterium that is a common cause of sexually transmitted infections and one of the main pathogens responsible for NGU.
Mycoplasma genitalium:A type of bacteria that can cause non-gonococcal urethritis and is known for its resistance to multiple antibiotics.
Pelvic Inflammatory Disease (PID): An infection of the female reproductive organs often caused by sexually transmitted bacteria, including those causing NGU.