A worker sprays anti-mosquito fog at a playground in Pangudi Luhur School Foundation, Jakarta, Indonesia, March 15, 2020. Dengue fever is a mosquito-borne disease caused by one of four closely related dengue viruses. The disease is transmitted by the bite of an aedes mosquito, particularly an aedes aegypti mosquito, infected with a dengue virus. Controlling the number of the adult and larval population of the mosquito was essential for reducing transmission of the dengue viruses. (Xinhua/Agung Kuncahya B.)

A worker sprays anti-mosquito fog at a playground in Pangudi Luhur School Foundation, Jakarta, Indonesia, March 15, 2020. Dengue fever is a mosquito-borne disease caused by one of four closely related dengue viruses. The disease is transmitted by the bite of an aedes mosquito, particularly an aedes aegypti mosquito, infected with a dengue virus. Controlling the number of the adult and larval population of the mosquito was essential for reducing transmission of the dengue viruses. (Xinhua/Agung Kuncahya B.)

A worker sprays anti-mosquito fog at a playground in Pangudi Luhur School Foundation, Jakarta, Indonesia, March 15, 2020. Dengue fever is a mosquito-borne disease caused by one of four closely related dengue viruses. The disease is transmitted by the bite of an aedes mosquito, particularly an aedes aegypti mosquito, infected with a dengue virus. Controlling the number of the adult and larval population of the mosquito was essential for reducing transmission of the dengue viruses. (Xinhua/Agung Kuncahya B.)