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The disease appears in four different presentations:<br>'''Intestinal adenomatosis - '''The basic hyperplastic and metaplastic changes are seen in the epithelium, which causes chronic weight loss and diarrhoea. <br>'''Necrotic enteritis''' - Predominately affects the colon and terminal ileum and parts of the hyperplastic mucosa develop erosions and ulcerations which then become colonised by Fusiformis baceria. <br>'''Terminal ileitis - '''Characterised by marked hypertrophic thickening of the muscular portion of the wall of the terminal ileum and there is associated thickening of the mucosa due to hypertrophy and secondary granulomatous inflammation, which is caused by a degree of obstruction to the passage of ingesta along the bowel caused by the mucosal hypertrophy. Its appearance is very similar to Johnes disease with lots of mononuclear cells and a chronic granulomatous type of inflammation. <br>'''Proliferative haemorrhagic syndrome - '''The bowel shows proliferation but with ulceration and copious haemorrhage into the bowel lumen. Animals are often be found dead. The pathogenesis is unclear but may involve a type of hypersensitivity reaction or secondary infection of some type. <br>
The disease appears in four different presentations:<br>'''Intestinal adenomatosis - '''The basic hyperplastic and metaplastic changes are seen in the epithelium, which causes chronic weight loss and diarrhoea. <br>'''Necrotic enteritis''' - Predominately affects the colon and terminal ileum and parts of the hyperplastic mucosa develop erosions and ulcerations which then become colonised by Fusiformis baceria. <br>'''Terminal ileitis - '''Characterised by marked hypertrophic thickening of the muscular portion of the wall of the terminal ileum and there is associated thickening of the mucosa due to hypertrophy and secondary granulomatous inflammation, which is caused by a degree of obstruction to the passage of ingesta along the bowel caused by the mucosal hypertrophy. Its appearance is very similar to Johnes disease with lots of mononuclear cells and a chronic granulomatous type of inflammation. <br>'''Proliferative haemorrhagic syndrome - '''The bowel shows proliferation but with ulceration and copious haemorrhage into the bowel lumen. Animals are often be found dead. The pathogenesis is unclear but may involve a type of hypersensitivity reaction or secondary infection of some type. <br>
== Clinical Signs ==
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Clinical signs are variable.
*Anything from poor weight gain to diarrhoea, weight loss, cachexia and death.
*Seen often as problem in closed, low infection herds.
*Seen often as problem in closed, low infection herds.
**Not seen in pigs with lots of other pathogens in guts.
**Not seen in pigs with lots of other pathogens in guts.