各种生活方式，如清洁的食物和水，抗生素，减少和寄生虫，动物，病毒和传染病的接触，也许引起了全球范围过敏症的蔓延。
Either way, clean water and food, antibiotics, reduced exposure to parasites, animals, viruses and infectious diseases may have caused our progressive worldwide allergies.
随着更多欧洲人到来，他们带来了大量欧洲以外未曾存在过的昆虫和动物传染病。
As more Europeans followed, they brought a plethora of insects and animal-borne diseases that had not previously existed outside Europe.
难民安置营地肮脏拥挤，原来村庄里泥浆和停滞的臭水中的动物尸体开始腐烂，传染病随时可能发生。
The threat of epidemic disease lurks in unhygienic, crowded camps and back in villages where putrefying animals lie under the mud and in pools of stagnant water.
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