fumigation

Health authorities with the help of the Cuban army fumigate against the Aedes aegypti mosquito to prevent the spread of zika, chikungunya and dengue in a street of Havana

Yamil Lage/AFP

Health authorities with the help of the Cuban army fumigate against the Aedes aegypti mosquito to prevent the spread of zika, chikungunya and dengue in a street of Havana

An Indian man covers his nose as a Delhi municipal worker fumigates the area to prevent mosquitos from breeding after the number of dengue fever deaths in the city rose, in New Delhi, India, Thursday, Sept. 26, 2013. Dengue fever is a potentially serious mosquito-borne virus.

Manish Swarup/AP

An Indian man covers his nose as a municipal worker fumigates the area to prevent mosquitoes from breeding after the number of dengue fever deaths rose in New Delhi. Dengue fever is a potentially serious mosquito-borne virus.