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.
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