如果同卵双胞胎彼此在疾病方面比异卵双胞胎更相似，那么这种疾病的易感性至少在一定程度上是由遗传造成的。

If identical twins are more similar to each other with respect to an ailment than fraternal twins are, then vulnerability to the disease must be rooted at least in part in heredity.

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这项研究表明，有些疾病是遗传基因易感性和病毒感染的共同作用引发的。

The research shows that some illnesses may require a combination of genetic predisposition and infection.

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全世界68亿人口中大部分人对任何传染性疾病都有遗传易感性。

Any contagious disease that most of the world's 6.8 billion people can catch is inherently dangerous.

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