A 32-year-old woman presents with vaginal itching and an unusual discharge for the past two weeks. The discharge is described as frothy, yellow-green, and foul-smelling. She also reports dyspareunia (pain during intercourse) and mild dysuria. She has had multiple sexual partners over the past six months without consistent condom use. On speculum examination, there is frothy, yellow-green discharge, erythema of the vaginal walls, and a strawberry cervix with punctate hemorrhages. A wet mount reveals motile, flagellated organisms. Which organism is the most likely cause of her symptoms?
