Final answer:
Ureaplasma urealyticum is not associated with nongonococcal urethritis (NGU).
Step-by-step explanation:
NGU stands for nongonococcal urethritis, which is inflammation of the urethra unrelated to Neisseria gonorrhoeae. The species that is NOT associated with NGU is Ureaplasma urealyticum. Other species associated with NGU include Chlamydia trachomatis, Mycoplasma genitalium, and Mycoplasma hominis.