Pathological Observations on 2 Horses of Myeloencephalopathy Associated with Equine Herpesvirus 1 (EHV-1) Infection

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During the epizootic of EHV-1 infection involving 132 of about 2, 000 racehorses at the Ritto Training Center of the Japan Racing Association in the western part of Japan, 1989, 7 horses developed paralysis after the onset of the febrile illness.Of the 7 horses showing the development of neutralizing antibodies against EHV-1, 2 were necropsied for pathological studies. In horse No. 1, small malaciae were found in the capsula interna, pons and spinal cord. Sporadic vasculitis with thrombus, which caused malaciae, was observed in the small arteries and veins of the brain and spinal cord. Horse No. 2 had perivascular cuffing in the brain and demyelination in the spinal cord. Edema and demyelination was also noted in the rami labiales superiores of the trigeminus nerve and ischiadicus nerve. From these results, it was suggested that paralysis developed in horses was caused by myeloencephalopathy associated with EHV-1.
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