An Indian health worker fumigates an area in order to prevent the spread of mosquito-borne diseases in Allahabad, India, Wednesday, September 14, 2016. Despite efforts, including spraying vast areas with clouds of diesel smoke and insecticide, several Indian cities battle dengue fever and other mosquito-borne diseases like chikungunya every year during and after the rainy season. (Photo by Rajesh Kumar Singh/AP Photo)
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