Review Question - QID 109802

A 52-year-old woman presents to her primary care provider with vaginal discharge. She has noticed an increased amount of vaginal discharge for 5 days but denies pruritus, dyspareunia, or postcoital bleeding. She is generally healthy, but was recently treated for a urinary tract infection with levofloxacin. Her medical history is otherwise significant for hypertension managed with lisinopril. The patient is sexually active with men and endorses 2 new sexual partners over the last month. Her temperature is 98.6°F (37°C), blood pressure is 138/89 mmHg, pulse is 82/min, and respirations are 12/min. On pelvic exam, the patient has off-white malodorous discharge without vulvar erythema. Saline microscopy demonstrates the finding seen in Figure A. Which of the following is the most likely diagnosis?