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* An anaerobic spirochaete.
* An anaerobic spirochaete.
* Causes [[Intestines Fibrinous/Haemorrhagic Enteritis - Pathology#Swine Dysentery|swine dysentery]].
* Causes [[Intestines Fibrinous/Haemorrhagic Enteritis - Pathology#Swine Dysentery|swine dysentery]].
**''B. hyodysenteriae'' causes [[Intestines Fibrinous/Haemorrhagic Enteritis - Pathology#Swine Dysentery|swine dysentery]]
**Infection is acquired via contaminated faeces
**Disease spreads slowly through the herd
**Dogs, rats, mice and flies may act as transport hosts
**''B. hyodysenteriae'' survives several weeks in moist faeces
*Clinical signs
**''B. hyodysenteriae'' causes dysentry in weaned pigs 6-12 weeks old; pigs lose condition and become emaciated; appetite is decreased; large amount of mucous may be present in the faeces; low mortality; poor feed conversion ratio
*Diagnosis
**History, clinical signs and gross pathology
**Anaerobic culture on blood agar with added antibiotics for at least 3 days
**''B. hyodysenteriae'' causes complete haemolysis whereas other spirochaetes cause partial haemolysis
**Immunofluorescence, DNA probes and biochemical tests
**Serology using ELISA can be used on a herd basis
**PCR