(Redirected from Vaginosis). Bacterial vaginosis (BV), also known as vaginal bacteriosis or Gardnerella vaginitis, is a disease of the vagina caused by excessive bacteria. Common symptoms include increased vaginal discharge that often smells like fish.Redirected from Vaginosis). Bacterial vaginosis (BV), also known as vaginal bacteriosis or Gardnerella vaginitis, is a disease of the vagina caused by excessive bacteria. Common symptoms include increased vaginal discharge that often smells like fish.