这是一个普遍的误区，即病原体在跨物种传播后会变得不那么严重。
It is a widespread myth that pathogens always evolve to become less severe after jumping species.
这种传染病不但致命，而且少有地能跨物种传播，但其传染性有限，禽肉只要充分加热，便不具危险。
Avian flu is not only particularly virulent; italso has the rare capacity to cross barriers between species. But it is hard totransmit.
该发现对于中止其他动物身上类似疾病的传播和了解肿瘤的跨物种演化可能具有更深的意义。
The findings may have broad implications for halting the spread of similar diseases in other animals and for understanding cancer progression across species.
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