Article Text

Management of headshaking in three horses by treatment for protozoal myeloencephalitis
  1. L. A. Moore, DVM1,
  2. P. J. Johnson, BVSc, MS, DipACVIM, MRCVS1,
  3. N. T. Messer IV, DVM1,
  4. K. L. Kline, DVM1,1,
  5. L. M. Crump, DVM2 and
  6. J. R. Knibb, DVM2
  1. 1 Department of Veterinary Medicine and Surgery, College of Veterinary Medicine, University of Missouri, Columbia, MO 6521 1, USA
  2. 2 Westover Ridge Equine Veterinary Partners, PO Box 655, Chesterfield, MO 63006, USA


Unlike the incidence of equine protozoal myeloencephalitis (EPM), which appears to be increasing, headshaking is an uncommon problem for horses in Missouri and the adjacent states. Equine protozoal myeloencephalitis was incriminated in three horses examined for the treatment of headshaking on the basis of a neurological examination, an analysis of cerebrospinal fluid and their response to treatment. The headshaking and stereotypical behaviour associated with EPM was successfully treated with potentiated sulphonamides and pyrimethamine.

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      • Dr Kline's present address is Department of Veterinary Clinical Sciences, College of Veterinary Medicine, Iowa State University, Ames, IA 50011, USA

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