The H5N1 virus is a long way from becoming adapted to humans, but limited testing and tracking mean we could miss danger signs.

中文翻译：

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牛身上的禽流感会导致人类爆发吗？反应缓慢令科学家担忧

H5N1 病毒距离适应人类还有很长的路要走，但有限的测试和追踪意味着我们可能会错过危险信号。