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Porcine intestinal spirochaetosis is a notifiable pig disease caused by certain spirochetal bacteria [Brachyspira hyodysenteriae and Brachyspira pilosicoli. Infection causes mild gastrointestinal signs in young pigs and can also be transmitted as intestinal spirochetosis in humans, as it is a zoonosis.
The disease is widespread in pig-rearing countries and may be referred to as PIS, spirochaetal diarrhoea and porcine colonic spirochaetosis.
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