它如此分布广泛，使的研究人员意识到可能有多种原因，包括特定的病毒和其他传染疾病。

That it is so widespread suggests to some researchers that there are many causes, including exposure to certain viruses and other infectious diseases.

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最后，气温和降雨规律的变化预计会改变传播传染病的昆虫媒介的地域分布。

Finally, changing temperatures and patterns of rainfall are expected to alter the geographical distribution of insect vectors that spread infectious diseases.

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传染病载体空间分布的改变。

Altered spatial distribution of some infectious disease vectors.

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