Pleomorphic, gram-variable rods. Catalase and oxidase negative.

- Involved in bacterial vaginosis (excessive growth of certain anaerobic bacteria in vagina).

- Thin, gray vaginal discharge with a fishy smell; nonpainful (vs vaginitis). Not itchy.- Amine whiff test – mixing discharge with 10% KOH enhances fishy odor.

- Associated with sexual activity, but not sexually transmitted

- Clue cells (vaginal epithelial cells covered with Gardnerella) have stippled appearance along outer margin.

- Treatment: metronidazole or clindamycin