The transmission of the arboviral agents of dengue, yellow fever, Chikungunya, and Zika by Aedes mosquitoes represents expanding threats to global health. At the 69th World Health Assembly, the WHO Director-General Margaret Chan declared that the spread of the Zika virus was "the result of the abandon of mosquito control" by governments since the 1970s and urged Member States to mobilize more efforts and resources to prevent further spread of the diseases.