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Pulmonary botryomycosis in a Scottish highland steer
M A Miller1, W H Fales, J W Tyler
1Veterinary Medical Diagnostic Laboratory, College of Veterinary Medicine, University of Missouri, Columbia 65205, USA.
Summary
This study details a rare case of pulmonary botryomycosis in a Scottish Highland steer. The condition, caused by Staphylococcus aureus, led to chronic pneumonia and airway obstruction.
Area of Science:
- Veterinary Pathology
- Bacteriology
Background:
- Botryomycosis is an uncommon bacterial infection characterized by pyogranulomatous inflammation and eosinophilic granule formation.
- Staphylococcal botryomycosis typically manifests as wound infections in horses or mastitis in cattle and sows.
Observation:
- A 5 1/2-year-old Scottish Highland steer presented with chronic, intractable pneumonia and cough.
- Necropsy revealed pulmonary findings including a collapsed accessory lung lobe, adhesions, and a polypoid mass obstructing the lobar bronchus.
Findings:
- Histologic examination diagnosed pyogranulomatous pneumonia with eosinophilic granules and "club" formation surrounding gram-positive cocci.
- Staphylococcus aureus was isolated from the lung tissue.
- The polypoid mass nearly occluded the lobar bronchus, with distal bronchi filled with mucopurulent exudate.
Implications:
- This case represents a rare occurrence of pulmonary botryomycosis in cattle.
- Highlights the importance of considering unusual bacterial responses in diagnosing chronic respiratory diseases in livestock.
- Contributes to the limited literature on bovine pulmonary botryomycosis.