当前的理论是，由于人类猎杀或食用了感染后的黑猩猩而传染上这种疾病的。
The leading theory is that it was picked up by people who hunted or ate infected chimpanzees.
人吃了感染疯牛病的牛肉有可能染上这种致命的疾病。
The fatal disease can be transmitted to humans eating meat from an infected animal.
没有，但是不排除西尔有7/2的赔率感染上疟疾，这将使他成为下一个感染上这种流行的致命疾病的名人。
No, but that didn't stop William Hill offering 7/2 odds on him contracting malaria, making him the favourite celeb to be the next to catch this fashionable, often fatal, disease.
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