舞毒蛾还会受到核多角体病毒或萎蔫病的攻击，在毛虫爆发的年代，这是一种特别重要的杀手。
The gypsy moth is also subject to attack by the nucleopolyhedrosis virus, or wilt disease, a particularly important killer of the caterpillars in outbreak years.
想像一下，一个病毒杀手，一个变异如此频繁的小生物肯定会产生抵抗一切药物的能力。
Imagine a killer virus, a bug that mutates so often that it inevitably finds a way to resist every drug.
大部分感染人群在很短时间内会使得流行性疾病发生变异，甚至病毒本身就不是一个有效杀手。
And the large Numbers infected within a short time make pandemics disruptive, even when the virus itself is not an efficient killer.
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