Bacterial vaginosis is a common condition of the vagina caused by an overgrowth of various germs. It is not one infection, caused by one type of germ. The vagina normally has a mix of germs (bacteria), including anaerobic bacteria and lactobacilli, but in bacterial vaginosis (BV) the balance changes. As a result, the anaerobic bacteria multiply …
https://patient.info/sexual-health/vaginal-discharge-female-discharge/bacterial-vaginosis

