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当前学科：兽医寄生虫病学
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放牧犊牛群入秋后相继出现食欲不振、贫血、消瘦症状，并有顽固性下痢，粪便发黑，有时带有血液，犊牛生长缓慢。利用左旋咪唑驱除后，在粪便中检出大量头部向背侧弯曲，口囊大、呈漏斗状，长15～25mm的虫体。该犊牛可能感染的病原是（）
A . 犊牛新蛔虫
B . 牛仰口线虫
C . 食道口线虫
D . 捻转血矛线虫
E . 蛇形毛圆线虫
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