Peer-reviewed veterinary case report
Skin pustules and nodules caused by Actinomyces viscosus in a horse.
- Journal:
- Journal of the American Veterinary Medical Association
- Year:
- 1991
- Authors:
- Specht, T E et al.
- Affiliation:
- Department of Food Animal and Equine Medicine and Surgery
- Species:
- horse
Plain-English summary
A 12-year-old Arabian stallion had a stubborn skin issue for two years, which included bumps and pus-filled spots on his back that would burst. Tests showed that the problem was caused by a type of bacteria called Actinomyces viscosus. To treat this, the horse received a combination of medications over several weeks, including isoniazid, trimethoprim-sulfadiazine, and sodium iodide. After following this treatment plan, the horse's skin condition improved and was resolved.
Abstract
A 12-year-old Arabian stallion was evaluated for a refractory skin problem of 2 years' duration. Skin nodules and pustules, which would rupture, had developed over the right lumbar muscles. Anaerobic culturing from the pustules yielded Actinomyces viscosus, and histologic examination of biopsy specimens revealed globular eosinophilic structures. Concomitant treatment with isoniazid (8 mg/kg of body weight, q 24 h for 8 weeks), trimethoprim-sulfadiazine (30 mg/kg, q 24 h for 8 weeks), and sodium iodide solution (66 mg/kg, every 1, 2, or 4 weeks, for 32 weeks) resolved the condition.
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Search related cases →Original publication: https://pubmed.ncbi.nlm.nih.gov/2010343/