A genus of anaerobic intestinal bacteria in the order Spirochaetaceae. Formerly Serpulina. Some species were previously in the genus Treponema.
- B. aalborgi — infects primates, but its pathogenic significance is uncertain.
- B. alvinipulli — a cause of diarrhea in adult chickens.
- B. hyodysenteriae — the cause of swine dysentery. Previously called Serpulina hyodysenteriae and Treponema hyodysenteriae.
- B. intermedia — a cause of diarrhea in adult chickens.
- B. pilosicoli — causes intestinal or colonic spirochetosis, a mild colitis and diarrhea in weaner and grower pigs and of wet litter and reduced egg production in adult chickens.
