False-colour transmission electron micrograph of Gardnerella vaginalis bacteria. G. vaginalis is one of several species of bacterium associated with bacterial vaginosis (also known as anaerobic vaginosis or non-specific vaginitis). The infection is sexually transmitted and causes a watery, non-irritating discharge which has a characteristic fishy odour. Treatment is with metronizadole. Male partners are treated concurrently to avoid reinfection. Magnification: x140,000 at 8x10, x20,000 at 35mm size.