Equine protozoal myeloencephalitis in a pony.
A 10-year-old pony died 5 days after the onset of a nervous disorder. Necropsy revealed a yellowish area of discoloration (1.5 by 1 cm) in the medulla oblongata. Microscopically, necrosis and nonsuppurative myeloencephalitis were found in the medulla oblongata. Immature and mature meronts (25 by 10 microns) were seen in neural tissue and in capillaries of the brain stem. Organisms were similar structurally to those seen in equine protozoal myeloencephalitis of horses.
D000818:Animals; D004683:Encephalomyelitis, Equine / Q000469:parasitology / Q000473:pathology / Q000662:veterinary*; D005260:Female; D006734:Horse Diseases / Q000469:parasitology* / Q000473:pathology; D006736:Horses; D011528:Protozoan Infections / Q000473:pathology; D011529:Protozoan Infections, Animal