''B. hyodysenteriae'' survives several weeks in moist faeces. Carrier pigs shed ''B. hyodysenteriae'' for up to 3 months, acting as a source of infection for healthy pigs. | ''B. hyodysenteriae'' survives several weeks in moist faeces. Carrier pigs shed ''B. hyodysenteriae'' for up to 3 months, acting as a source of infection for healthy pigs. |