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Protozoal encephalomyelitis in horses: 82 cases (1972-1986)
M G Boy1, D T Galligan, T J Divers
1Department of Clinical Studies, New Bolton Center, School of Veterinary Medicine, University of Pennsylvania, Kennett Square 19348.
Abstract:
Medical records of 82 horses with clinical signs of neurologic disease and histologic lesions suggestive of protozoal encephalomyelitis were reviewed. The presence of a protozoan parasite in the CNS was not influenced by prior treatment of the horse with corticosteroids. Prior treatment of horses with trimethoprim-sulfonamide alone or in combination with pyrimethamine resulted in a decreased number of horses in which a protozoan parasite was detected in the CNS at necropsy. The mean age of affected horses was 3.62 +/- 2.78 years, with male and Standardbred horses being overrepresented, compared with that of the hospital population of horses that were studied at the same time.
Insights
Protozoal encephalomyelitis in horses is not affected by corticosteroid use. However, trimethoprim-sulfonamide and pyrimethamine treatments may decrease the detection of protozoan parasites in the central nervous system (CNS).
Area of Science:
- Veterinary Neurology
- Equine Medicine
- Parasitology
Background:
- Protozoal encephalomyelitis is a significant neurologic disease in horses.
- Accurate diagnosis and understanding of contributing factors are crucial for effective treatment and management.
Purpose of the Study:
- To investigate the influence of prior treatments on the detection of protozoan parasites in the CNS of horses with suspected protozoal encephalomyelitis.
- To identify demographic factors associated with affected horses.
Main Methods:
- Retrospective review of medical records from 82 horses with clinical signs and histologic lesions suggestive of protozoal encephalomyelitis.
- Analysis of the impact of corticosteroid and antimicrobial (trimethoprim-sulfonamide, pyrimethamine) treatments on parasite detection.
- Comparison of demographic data (age, sex, breed) with the general hospital population.
Main Results:
- Corticosteroid treatment did not affect the presence of protozoan parasites in the CNS.
- Prior treatment with trimethoprim-sulfonamide (alone or with pyrimethamine) was associated with a decreased detection rate of CNS protozoan parasites.
- Male and Standardbred horses were overrepresented in the affected population, with a mean age of 3.62 years.
Conclusions:
- Antimicrobial treatments may affect the diagnostic yield of protozoal parasites in equine CNS disease.
- Standardbreds and younger male horses appear to be at higher risk for this condition.
- Further research is needed to understand the implications of antimicrobial use on diagnostic accuracy.