Dubey J P, Miller S
J Am Vet Med Assoc. 1986 Jun 1;188(11):1311-2.
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.
一匹10岁的小马在出现神经紊乱症状5天后死亡。尸检发现延髓有一个淡黄色变色区域（1.5×1厘米）。显微镜检查显示，延髓存在坏死和非化脓性脑脊髓炎。在神经组织和脑干毛细血管中发现了未成熟和成熟的裂殖体（25×10微米）。这些生物体在结构上与马的马属动物原生动物脑脊髓炎中所见的生物体相似。
