Skin pustules and nodules caused by Actinomyces viscosus in a horse
Specht, T.E.; Breuhaus, B.A.; Manning, T.O.; Miller, R.T.; Cochrane, R.B.
Journal of the American Veterinary Medical Association 198(3): 457-459
1991
ISSN/ISBN: 0003-1488 PMID: 2010343 Document Number: 369991
In a 12-year-old Arabian stallion with 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 A. viscosus, and histological examination of biopsy specimens revealed globular eosinophilic structures. Concomitant treatment with isoniazid (8 mg/kg of body weight, every 24 h for 8 weeks), trimethoprim-sulfadiazine (30 mg/kg, every 24 h for 8 weeks), and sodium iodide solution (66 mg/kg, every 1, 2 or 4 weeks, for 32 weeks) resolved the condition.