Hopkins N C
Vet Rec. 1986 Jun 28;118(26):715-7. doi: 10.1136/vr.118.26.715.
The precise aetiology of enzootic haematuria in cattle remains unknown. The involvement of bracken fern (Pteridium aquilinium) appears certain because of the close association between bracken fern infested farms and enzootic haematuria. Several toxic principles have been identified but the main carcinogenic element remains to be conclusively demonstrated. More recently, bovine papilloma virus has been implicated in the aetiology of enzootic haematuria. Its possible interaction with bracken fern carcinogen is discussed.
牛地方流行性血尿的确切病因尚不清楚。由于蕨菜滋生的农场与地方流行性血尿之间存在密切关联，蕨菜（欧洲蕨）的 involvement 似乎是确定的。已经确定了几种有毒成分，但主要致癌因素仍有待最终证实。最近，牛乳头瘤病毒被认为与地方流行性血尿的病因有关。本文讨论了它与蕨菜致癌物可能的相互作用。
这里“involvement”直译为“参与、卷入”，结合语境意译为“关联”更合适，但按照要求未添加解释。
