Some digging around in historical records revealed that there was a change in the incidence of water-borne disease at that time, especially dysentery.

一些历史记录显示，当时水源性疾病的发病率发生了变化，尤其是痢疾。

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He says looking back thousands of years can help researchers look forward by understanding how a disease changed over time.

VOA: special.2010.06.29

It was easy to tell if somebody had an infectious disease but you might not have known that they had cancer at that time and they just died.

如果有人患有感染性疾病,那很容易判断,但在那个时候医生可能不知道,病人得的就是癌症,病人就这么死去了

耶鲁公开课 - 生物医学工程探索课程节选

What was known at that time was that there was a disease in people, and there was a different disease in cows, and they looked the same some way.

当时人们所知道的就是,人得了一种病,奶牛得了另一种病,这两种病在某些方面很像

耶鲁公开课 - 生物医学工程探索课程节选

But it's difficult to envision deploying tens of millions of health workers for a single disease each time, especially since the Indian health system faces crippling health human resource shortages.

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Measles is particularly dangerous in young infants but anyone can get the disease at any time.

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Barer says Celgene is open to applying for approval one disease at a time.

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