这是因为病毒性疾病一般发生在病毒的宿主从某个物种跳跃到另一个物种，继而进化以利用新宿主的方式变异之后。
That is because new viral diseases generally happen when a virus mutates in a way that allows it to jump species, and then continues to evolve to exploit its new host.
严重急性呼吸综合征（SARS ） ： 新宿主或是新创作旧病毒跳跃?。
Severe acute respiratory syndrome (SARS): An old virus jumping into a new host or a new creation?
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