Animal bites in humans can be deadly.

动物咬的伤口可能致命。

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One obstacle is that in order for the gene called neurogenin3 to bond with a cell it needs to be transported by a virus which could be deadly to humans.

所存在的一个技术障碍是，为将所注射的叫神经配基3（neurogenin3）的基因与肝细胞结合，需要一种病毒来转运该基因，而该病毒对人类可能是致命的。

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While this "bird flu" proves deadly to humans, killing more than half of its victims, it is kept in check by its inability to spread readily from human to human.

这“禽流感”证明对人是致死的，感染者一半以上可以被杀死，所幸它在人与人之间传播不易。

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Radiation for example, is invisible, has no smell or odor, while it is extremely deadly for the humans.

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H5 virus which is responsible for avian flu, a disease that has forced a mass slaughter of poultry in many countries and could, if it mutates, cause a deadly epidemic among humans.

ECONOMIST: The World Health Organisation

Most of the viruses are harmless, but some are potentially deadly when passed to humans.

CNN: Tracking deadly viruses' spread from animals to humans