Actinomyces viscosus
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- Commensal of oral cavity of dogs and humans
- Canine actinomycosis
- Causes localised subcutaneous pyogranulomatous lesions and fibrovascular proliferation of peritoneal (peritonitis) and pleural surfaces in dogs
- Leads to pyothorax
- Respiratory distress
- Cutaneous pustules in horses
- Abortion in cattle
- Rods contained in soft grey granules which release the organism when squashed
- Two types of colonies: large and smooth colonies with V, Y and T configurations or small and rough colonies with short branching filaments
- Grow in 10% carbon dioxide
- Usually responds to penicillin