A young adult female patient presents with lower abdominal pain, fever, and abnormal vaginal discharge. She undergoes a nucleic acid amplification test (NAAT) test on material collected by a vaginal swab, which is negative for gonorrhea but positive for another bacterium known to be a common cause of pelvic inflammatory disease (PID) in the USA. What is this bacterium?
A. Staphylococcus aureus
B. Mycoplasma genitalium
C. Chlamydia trachomatis
D. Gardnerella vaginalis