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Staphylococcal septic arthritis in three horses.
Equine Veterinary Journal
|April 1, 1979
Summary
Staphylococcus aureus caused monarticular septic arthritis in three horses. Antibiotic treatment achieved sterile joint fluid, but two horses developed degenerative joint changes, requiring surgery in one case.
Area of Science:
- Veterinary Medicine
- Microbiology
- Equine Health
Background:
- Monarticular septic arthritis in horses is a significant cause of lameness and potential joint destruction.
- Staphylococcus aureus is a common bacterial pathogen in equine infections, including joint infections.
Observation:
- Three horses presented with monarticular septic arthritis confirmed by bacterial culture of joint tissues and fluid.
- The Staphylococcus aureus isolates were identified as common human phage types, with two exhibiting beta-lactamase activity.
Findings:
- Antibiotic therapy, including cloxacillin, methicillin, and penicillin, resulted in sterile synovial fluid cultures in all treated horses.
- Despite successful bacterial eradication, two horses experienced irreversible degenerative articular changes.
- One horse with severe degenerative changes required arthrodesis of the fetlock joint.
Implications:
- Early and accurate diagnosis of Staphylococcus aureus septic arthritis is crucial for effective treatment in horses.
- The emergence of beta-lactamase producing strains necessitates careful antibiotic selection and management strategies.
- Degenerative joint changes can occur even after successful treatment, highlighting the importance of monitoring and potential long-term joint health management in affected horses.