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Proliferative haemorrhagic enteropathy.

G H Lawson, A C Rowland, L Roberts

Research in Veterinary Science

|July 1, 1979

Summary

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Viable Campylobacter sputorum subsp mucosalis are scarce in pigs with proliferative haemorrhagic enteropathy. This suggests immune responses may hinder bacterial detection in affected intestinal tissues.

Area of Science:

Veterinary Pathology
Microbiology
Immunology

Background:

Proliferative haemorrhagic enteropathy and porcine intestinal adenomatosis are significant swine enteric diseases.
Campylobacter sputorum subsp mucosalis is implicated in porcine intestinal adenomatosis.

Purpose of the Study:

To investigate the presence and role of Campylobacter sputorum subsp mucosalis in proliferative haemorrhagic enteropathy.
To compare mucosal changes and immune responses in proliferative haemorrhagic enteropathy and porcine intestinal adenomatosis.

Main Methods:

Histopathological examination of intestinal mucosa from pigs with proliferative haemorrhagic enteropathy.
Immunohistochemical analysis to detect Campylobacter sputorum subsp mucosalis and IgA deposition.
Comparison with tissues from pigs recovering from adenomatosis.

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Main Results:

Viable Campylobacter sputorum subsp mucosalis were absent or present in low numbers in pigs with proliferative haemorrhagic enteropathy.
Mucosal lesions in proliferative haemorrhagic enteropathy resembled those in recovering adenomatosis.
Intracellular organisms in proliferative haemorrhagic enteropathy were identified as mucosalis.
Elevated IgA levels were observed in both conditions, suggesting an immune-mediated mechanism for bacterial non-recovery.

Conclusions:

The failure to culture Campylobacter sputorum subsp mucosalis in proliferative haemorrhagic enteropathy may be due to immunological factors.
Immune responses, specifically IgA, play a role in the pathogenesis and detection of Campylobacter sputorum subsp mucosalis in swine enteric diseases.