Article Text

Actinomyces species as a cause of abscesses in nine horses
  1. C. L. Fielding, DVM1,
  2. K. G. Magdesian, DVM, DACVIM, DACVECC, DACVCP2,
  3. R. A. Morgan, DVM1,
  4. R. E. Ruby, BS2 and
  5. K. A. Sprayberry, DVM, DACVIM1
  1. 1 Loomis Basin Equine Medical Center, 3901 Sierra College Boulevard, Loomis, CA 95650, USA
  2. 2 Department of Medicine and Epidemiology, University of California, Davis, CA 95616, USA


The characteristics, history, clinical signs, treatment and outcome of nine horses with abscesses caused by Actinomyces species were reviewed. dna sequencing was used to determine the species of one of the isolates. The horses were one to 11 years of age, and the abscesses were most commonly located in the submandibular and retropharyngeal regions. The bacterium was usually cultured as the sole isolate and the horses were most often affected in the autumn. Most of the abscesses were treated with antimicrobials and drainage, but some of them recurred. The horses with submandibular abscesses had residual scar tissue that in some cases did not resolve.

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