No one now knows how easy it would be to turbo-charge an existing human pathogen, or take one that infects another type of animal and assist its passage over the species barrier.
现在没人知道激发一种既存的人体病菌有多么容易，不知道使病菌传染给另一种动物，帮助其跨越物种界限而传播有多么容易。
But no one had ever found a pathogen in an animal sick with the disease.
但没有人发现这种疾病的致病病毒。
On the other hand, when a plant is attacked by an insect, animal or pathogen, it knows.
另一方面，当植物受到昆虫、植物或病菌的侵害时它也知道。
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