Why dengue is so widespread this year

Also called"breakbone fever," dengue is one of the world's leading mosquito-borne illnesses and infects tens of millions across the world annually. Around half of the planet's population live in at-risk areas, mainly in Latin America, Africa and Asia. Outbreaks have ravaged Southeast Asia this year, infecting hundreds of thousands of people and killing hundreds as governments struggle to contain the untreatable virus.