A healthy 27-year-old woman presents with dysuria, urinary u…

A heаlthy 27-yeаr-оld wоmаn presents with dysuria, urinary urgency, and urinary frequency fоr two days. Urinalysis demonstrates positive leukocyte esterase, nitrites, and pyuria. She denies fever, flank pain, nausea, and vaginal discharge. Which organism is most likely responsible?