一般认为,疯牛病(bovine spongiform encephalopa-thy,BSE)的病因是食入了喂养反刍动物饲料中的蛋白质所致,BSE经口摄取后潜伏期平均4～5年,最近新的发病规律显示,该病经胎盘传给仔牛的可能性小,而牧场污染导致二次感染或违章使用污染饲料致病的可能性大。 新的变异型传染性海绵状脑病(Creutzfeldt—Jakob It is generally believed that the cause of bovine spongiform encephalopathy (BSE) is caused by ingestion of protein in the feed of ruminants, and the incubation period of BSE after oral ingestion is 4 to 5 years on average. A recent new rule of incidence shows that the disease The possibility of passing through the placenta to young piglets is small, and the possibility of pasture contamination causing secondary infection or illegal use of contaminated feed is highly likely. New Mutant Transmissible Spongiform Encephalopathy (Creutzfeldt-Jakob