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Tuberculosis-like granulomas in cattle caused by Actinomycetes
Australian Veterinary Journal
|October 1, 1976
Summary
Thin, branching, Gram-positive organisms were identified in cattle lesions, resembling tuberculosis. These findings highlight potential Nocardia/Streptomyces infections in bovine pathology.
Area of Science:
- Veterinary Pathology
- Bacteriology
Background:
- Bovine lesions at slaughter can present diagnostic challenges.
- Distinguishing infectious causes from other pathologies is crucial for herd health.
Purpose of the Study:
- To identify and characterize the causative agents in 280 bovine lesions.
- To compare the macroscopic and microscopic features of these lesions.
Main Methods:
- Macroscopic and microscopic examination of 280 cattle lesions.
- Bacterial culture and Gram staining for organism identification.
- Histopathological analysis including giant cell and necrosis assessment.
Main Results:
- Ten of 280 lesions harbored thin, branching, Gram-positive organisms (Nocardia/Streptomyces group).
- Three cases were confirmed by bacterial culture.
- Microscopy revealed foreign body giant cells in all lesions; older lesions showed necrosis, caseation, mineralization, and fibrosis.
Conclusions:
- Nocardia/Streptomyces species can cause distinct lesions in cattle.
- Histopathological features, including giant cells and necrosis, are characteristic.
- These findings contribute to understanding bovine bacterial infections.