More and more, these diseases are a public health threat, and almost every year the world's population is at risk of another disease of animal origin.

这类疾病不断增加对公共卫生的威胁。世界人口几乎每年都要受到一种新的源自动物的疾病的威胁。

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Scientists believe that dogs can sense disease in others because of their evolutionary origin as wolves, who needed to be able to detect when someone in the pack was hurt or sick.

科学家认为犬类能够闻出他人的病症是因其继承了狼类的净化血统，狼族需要能够嗅出其种群中是否有伤病员。

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Of African origin, the disease has been spreading around the world for decades.

起源于非洲，近几十年来这种病毒已经蔓延到世界各地。

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People of Indian origin living in the UK may be genetically more prone to coronary heart disease, researchers have said.

BBC: Indians 'genetically prone to heart disease'

Researchers from Hammersmith and Ealing Hospitals compared the way cells in a major artery function in 26 healthy people of Indian origin and 18 white men aged 35-60 who had no heart disease.

BBC: Indians 'genetically prone to heart disease'

Understanding the origin -- and the genetic behavior -- of a pathogen is the holy grail in the world of infectious disease.

CNN: Researchers say they found malaria's origin: In chimps