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Eosinophilic myositis in Canadian cattle
H J Smith1, K E Snowdon, G G Finley
1Agriculture Canada, Health of Animals Laboratory, Sackville, New Brunswick.
Summary
Trichinosis is unlikely to cause eosinophilic myositis in cattle. This study found no viable Trichinella larvae in affected cattle, though some had antibodies. Eosinophilic myositis lesions were common, often linked to sarcocystiosis.
Area of Science:
- Veterinary Pathology
- Parasitology
- Bovine Diseases
Background:
- Eosinophilic myositis is a suspected condition in Canadian cattle.
- Trichinosis is a parasitic infection that can affect various animals.
Purpose of the Study:
- To investigate the potential role of Trichinella infection in causing eosinophilic myositis in cattle.
- To identify other potential causes of myositis in the studied cattle population.
Main Methods:
- Histological examination of musculature from 198 cattle.
- Pepsin digestion of muscle tissue to detect parasite larvae.
- Enzyme-linked immunosorbent assay (ELISA) for anti-Trichinella antibodies in 51 cattle sera.
Main Results:
- No viable Trichinella larvae were recovered from any cattle.
- One of 51 cattle tested positive for anti-Trichinella antibodies.
- Eosinophilic myositis lesions were present in 75.2% of cattle.
- Sarcocystiosis was identified in 53% of cattle, in both normal and affected muscle.
Conclusions:
- Trichinosis is not a primary cause of eosinophilic myositis in Canadian cattle.
- Sarcocystiosis is a common finding and a potential differential diagnosis for myositis in cattle.