他对黄热病疫情对城市化进程的阻碍为一种巧合做出了解释。
He explained the yellow fever epidemic as a providential act to discourage urban growth.
城市型黄热病：如果受感染的人把病毒带入人口稠密的地区，而这些地区有很多人缺乏免疫力，并有伊蚊生存繁殖，就会发生大流行。
Urban yellow fever: Large epidemics occur when infected people introduce the virus into densely populated areas with a high number of non-immune people and Aedes mosquitoes.
然而，随着这一类蚊虫在该地区再次出现，城市型黄热病有可能死灰复燃。
However, this mosquito species has re-colonized urban areas in the region and poses a renewed risk of urban yellow fever.
城市人满为患，卫生条件恶劣，也为一些众所周知的疾病，例如黄热病和登革热的爆炸性流行创造了理想条件。
Urban crowding under unsanitary conditions also creates ideal conditions for explosive epidemics of well-known diseases, such as yellow fever and dengue.
黄热病再度出现，成为一个巨大祸患，随着整个非洲走向城市化，发生大流行的威胁越来越严重。
Yellow fever had returned as a major scourge and, as urbanization progresses across Africa, the threat of a major epidemic looms ever larger.
在过去二十年中，由于人群对疾病感染的免疫力下降、砍伐森林、城市化、人口流动和气候变化等因素的影响，黄热病病例数呈增加趋势。
The number of yellow fever cases has increased over the past two decades due to declining population immunity to infection, deforestation, urbanization, population movements and climate change.
虽然黄热病主要侵袭非洲和美洲大陆，但世界上许多地方仍存在发生城市大规模流行的可能性。
Though yellow fever affects predominantly the African and American continents, the potential for large-scale urban epidemics exists in many parts of the world.
虽然黄热病主要侵袭非洲和美洲大陆，但世界上许多地方仍存在发生城市大规模流行的可能性。
Though yellow fever affects predominantly the African and American continents, the potential for large-scale urban epidemics exists in many parts of the world.
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