|
|
| (9 intermediate revisions by 3 users not shown) |
| Line 1: |
Line 1: |
| − | * Swine dysentery gives rise to fibrinous/ haemorrhagic enteritis.
| + | #redirect[[Brachyspira hyodysenteriae]] |
| − | * 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]]
| |