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有报告认为,已有超过百万的感染了牛海绵状脑病(BSE)的牛肉进入了人的食物链。人们对BSE是否穿过种系屏障传染给人及其他动物的担心促使科学家们寻找BSE传染性的分子基础及评价指标。美国NIH等
There are reports that more than one million beef infected with bovine spongiform encephalopathy (BSE) have been brought into the human food chain. Concerns over the transmission of BSE across germ-line barriers to humans and other animals have prompted scientists to search for the molecular basis and assessment of BSE infectivity. United States NIH and so on