来自《耶鲁大学开放课程：1600年后西方社会的流行病 第12集 第12集》

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  one of the features of it--
  鼠疫和亚细亚霍乱的特点之一
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  and Asiatic cholera as well-- was a very high case fatality rate,
  就是高病死率
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  of plague, fifty to eighty percent,
  鼠疫50%到80%
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  cholera, something like fifty percent.
  霍乱则大概在50%左右
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  At the other extreme, when we come to it,
  相反 我们以后会讲到的流感
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  we'll see that influenza has a very high morbidity,
  它有很高的发病率
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  but quite a low case fatality rate, and that's related,
  但病死率却相当低
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  I think, to the impact that that disease, influenza, has on society,
  我认为 这解释了为什么流感不像
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  which isn't associated with such terror as say plague or cholera.
  鼠疫或霍乱那样给社会带来高度恐惧
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  That's an important variable, the kill rate of the disease.
  因此 病死率是一个重要的指标
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  Another factor, a third question we need to ask,
  我们需要提出的第三个重要问题是
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  is what's the nature of the symptoms
  这种流行病的症状