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Clinical presentation of experimentally induced rabies in horses.

Authors
  • Hudson, L C
  • Weinstock, D
  • Jordan, T
  • Bold-Fletcher, N O
Type
Published Article
Journal
Zentralblatt für Veterinärmedizin. Reihe B. Journal of veterinary medicine. Series B
Publication Date
Jul 01, 1996
Volume
43
Issue
5
Pages
277–285
Identifiers
PMID: 8779809
Source
Medline
License
Unknown

Abstract

Twelve naive and nine test-vaccinated horses which developed clinical signs of rabies as a result of the required protocol of a vaccine trial were prospectively observed. Nineteen of the 21 cases were confirmed positive for rabies infection of the brain by fluorescent antibody test. The two horses with negative results had ganglioneuritis of the trigeminal ganglion or lymphocytic perivascular cuffing in the brain stem in addition to clinical signs. Average incubation period was 12.3 days and average morbidity was 5.5 days. Naive animals had significantly shorter incubation and morbidity periods (P < 0.05). Muzzle tremors were the most frequently observed (81%) and most common initial sign. Other common signs were pharyngeal spasm or pharyngeal paresis (71%), ataxia or paresis (71%), lethargy or somnolence (71%). The furious form was manifested in 43% of rabid horses and some of these furious animals initially manifested the dumb form. The paralytic form was not observed. Histopathology was characteristics for rabies. The results of this trial do not reflect on the efficacy of commercially licensed equine rabies vaccines.

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