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Tissue-invading ciliates associated with chronic colitis in a horse
Journal of Comparative Pathology
|January 1, 1986
Summary
Ciliates resembling Polymorphella ampulla were found in a horse with chronic diarrhea. This normally commensal organism may have played a secondary pathogenic role in the horse's gastrointestinal issues.
Area of Science:
- Veterinary Parasitology
- Equine Medicine
- Gastroenterology
Background:
- Polymorphella ampulla are protozoan ciliates typically found as commensals in the equine gut.
- Chronic diarrhea and weight loss in horses can have multifactorial causes, including parasitic and microbial agents.
Purpose of the Study:
- To investigate the potential role of Polymorphella ampulla in a case of chronic equine diarrhea and weight loss.
- To identify causative agents in a Thoroughbred gelding with persistent gastrointestinal signs.
Main Methods:
- Post-mortem examination of the caecum and colon of a Thoroughbred gelding.
- Histopathological analysis of intestinal tissues to identify microorganisms.
- Assessment of helminth burden and screening for bacterial pathogens.
Main Results:
- Large numbers of ciliates resembling Polymorphella ampulla were identified in the caecal and colonic crypts and lamina propria.
- A significant helminth burden, primarily cyathostomes, was noted.
- No significant bacterial pathogens were isolated from the affected horse.
Conclusions:
- Polymorphella ampulla, usually a commensal, was implicated as a potential secondary pathogen in this case.
- The findings suggest that under certain conditions, opportunistic protozoa can contribute to equine gastrointestinal disease.
- Further research is warranted to understand the pathogenesis of Polymorphella ampulla in equine health and disease.
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