Fayer R, Johnson A J
J Infect Dis. 1975 Feb;131(2):189-92. doi: 10.1093/infdis/131.2.189.
Of 150 fecal samples from coyotes from northern Utah and southern Idaho, 21 contained coccidian sporocysts. These were found singly, contained four sporozoites and a granular residuum, and averaged 16.9 x 10.9 mum in size. None of four lambs inoculated with these sporocysts showed clinical signs of disease, and no parasites were found in their tissues. One calf inoculated with 135,000 sporocysts and another inoculated with 720,000 sporocysts eventually became unable to rise from recumbency. One was killed after 43 days; the other died at 50 days. Both calves had a mild mononuclear cell infiltration into the connective tissue adjacent to vessels in the heart, other striated muscles, kidney, and liver, and a moderate lymphoid hyperplasia in the spleen and lymph nodes. Schizonts were observed in a lymph node, and young sarcocysts were observed in skeletal and cardiac muscles. Four coyotes fed bovine heart infected with Sarcocystis passed sporulated sporocysts in their feces that were indistinguishable from those in the fecal samples from Utah and Idaho.
从犹他州北部和爱达荷州南部的郊狼身上采集了150份粪便样本，其中21份含有球虫孢子囊。这些孢子囊单个存在，含有四个子孢子和一个颗粒状残渣，大小平均为16.9×10.9微米。用这些孢子囊接种的四只羔羊均未表现出疾病的临床症状，其组织中也未发现寄生虫。一只接种了135,000个孢子囊的小牛和另一只接种了720,000个孢子囊的小牛最终无法站立起来。一只在43天后被宰杀；另一只在50天时死亡。两只小牛的心脏、其他横纹肌、肾脏和肝脏中靠近血管的结缔组织均有轻度单核细胞浸润，脾脏和淋巴结有中度淋巴样增生。在一个淋巴结中观察到裂殖体，在骨骼肌和心肌中观察到年轻的肉孢子虫囊。四只喂食感染了肉孢子虫的牛心脏的郊狼在粪便中排出了孢子化的孢子囊，这些孢子囊与来自犹他州和爱达荷州的粪便样本中的孢子囊无法区分。
