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Created page with '* Swine dysentery gives rise to fibrinous/ haemorrhagic enteritis. * A quite common and important disease. * The disease is caused by [[Brachyspira hyodysenteriae|''Brachyspira h…'
* Swine dysentery gives rise to fibrinous/ haemorrhagic enteritis.
* A quite common and important disease.
* The disease is caused by [[Brachyspira hyodysenteriae|''Brachyspira hyodysenteriae'']].
** Is not seen in gnotobiotic animals - other enteric pathogens such as [[Fusobacterium|''Fusobacterium'']] or [[Bacteroides|''Bacteroides'']] may therefore also be required in order to produce disease.
* The disease is NOT systemic.
** Localised to the [[Large Intestine - Anatomy & Physiology|large intestine]]- in particular, the spiral [[Colon - Anatomy & Physiology|colon]].
* Swine dysentery is spread by the faeco-oral route, and is carried by pigs and rodents.
===Clinical===
* Affects post weaning pigs at approximately 4 months of age.
* White scour becomes a liquid dirty red / brown scour with a foul smell.
** Contains poorly digested focal shreds of mucosa and fibrin strands.
*** '''Mucoid covered faeces'''.
* There are three outcomes to infection; the animal may:
** Die
** There is a morbidity up to 90% in the herd, with up to 50% mortality.
** Recover
** Become chronically infected.
* Symptoms are due to loss of absorption in [[Colon - Anatomy & Physiology|colon]].
** The [[Colon - Anatomy & Physiology|colon]] is normally a key site of absorption for water and electrolytes in the pig.
===Pathology===
* The serosa of the spiral [[Colon - Anatomy & Physiology|colon]] may appear shiny from the outside.
** Is turgid and oedematous.
** In severe cases, haemorrhage may be seen.
* The [[Small Intestine - Anatomy & Physiology|small intestine]] NOT affected.
* Fibrinous deposits are seen on the mucosa as the disease progresses.
** The mucosa underneath is eroded to expose blood vessels in lamina propria.
*** Accounts for the bleeding.
* Animals often recover, but have a low feed conversion ratio for sometime.
===Diagnosis===
* Silver stains show organisms in the epithelium of the mucosa.
* Also by immunofluorescence or electron microscopy.[[Category:Enteritis,_Bacterial]][[Category:Enteritis,_Fibrinous/Haemorrhagic]][[Category:Pig]]
* A quite common and important disease.
* The disease is caused by [[Brachyspira hyodysenteriae|''Brachyspira hyodysenteriae'']].
** Is not seen in gnotobiotic animals - other enteric pathogens such as [[Fusobacterium|''Fusobacterium'']] or [[Bacteroides|''Bacteroides'']] may therefore also be required in order to produce disease.
* The disease is NOT systemic.
** Localised to the [[Large Intestine - Anatomy & Physiology|large intestine]]- in particular, the spiral [[Colon - Anatomy & Physiology|colon]].
* Swine dysentery is spread by the faeco-oral route, and is carried by pigs and rodents.
===Clinical===
* Affects post weaning pigs at approximately 4 months of age.
* White scour becomes a liquid dirty red / brown scour with a foul smell.
** Contains poorly digested focal shreds of mucosa and fibrin strands.
*** '''Mucoid covered faeces'''.
* There are three outcomes to infection; the animal may:
** Die
** There is a morbidity up to 90% in the herd, with up to 50% mortality.
** Recover
** Become chronically infected.
* Symptoms are due to loss of absorption in [[Colon - Anatomy & Physiology|colon]].
** The [[Colon - Anatomy & Physiology|colon]] is normally a key site of absorption for water and electrolytes in the pig.
===Pathology===
* The serosa of the spiral [[Colon - Anatomy & Physiology|colon]] may appear shiny from the outside.
** Is turgid and oedematous.
** In severe cases, haemorrhage may be seen.
* The [[Small Intestine - Anatomy & Physiology|small intestine]] NOT affected.
* Fibrinous deposits are seen on the mucosa as the disease progresses.
** The mucosa underneath is eroded to expose blood vessels in lamina propria.
*** Accounts for the bleeding.
* Animals often recover, but have a low feed conversion ratio for sometime.
===Diagnosis===
* Silver stains show organisms in the epithelium of the mucosa.
* Also by immunofluorescence or electron microscopy.[[Category:Enteritis,_Bacterial]][[Category:Enteritis,_Fibrinous/Haemorrhagic]][[Category:Pig]]