It produces a thin white-grey discharge with a fishy odour.
It is not normally itchy or sore.
Diagnosis is made by Amsel's criteria, which requires 3 of the following 4:
- thin grey-white discharge
- fishy odour on adding an alkali
- pH >4.5 (normal pH 3.8-4.2)
- clue cells on microscopy
Treatment is given to symptomatic ladies.
Options include metronidazole and clindamycin.