A 30-yeаr-оld pаrаlegal analyst cоmes tо your clinic, complaining of a bad-smelling vaginal discharge with some mild itching, present for about 3 weeks. She tried douching but it did not help. She has had no pain with urination or with sexual intercourse. She has noticed the smell increased after intercourse and during her period last week. On speculum examination a thin gray-white discharge is seen in the vault. The pH of the discharge is over 4.5 and there is a fishy odor when potassium hydroxide (KOH) is applied to the vaginal secretions on the slide. Wet prep shows epithelial cells with stippled borders (clue cells). What type of vaginitis best describes her findings?