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Myositis = inflammation of muscle
Bacterial myositis occurs when bacteria gain entry via direct penetration, blood stream or extension from other areas. Lesions caused tend to be suppurative, serosanguinous or granulomatous.
- They are caused by pyogenic bacteria, usually: Arcanobacterium pyogenes in sheep and cattle, Streptococcus equi in horses, Corynebacterium pseudotuberculosis in sheep and goats. Pasteurella multocida causes cellulitis in cats.
- Abscesses usually present with localised suppuration and necrosis of myofibres, they may occasionally spread via the fascia.