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禽流感病毒在美新变异!更易在人类传播
美国内华达州奶牛群感染一种此前从未在奶牛身上发现过的H5N1禽流感病毒D1.1变种, 已经在北美导致1人死亡1人重病 ,病毒学家和研究人员处于高度警惕状态,警告说这种突变病毒标志着H5N1禽流感病毒传播的一个转折点, ...
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