Mosquito trials raise hopes of defeating dengue Hundreds dead in the Philippines; a threefold increase of cases in Vietnam; hospitals overrun in Malaysia, Myanmar and Cambodia -- dengue is ravaging Southeast Asia this year due in part to rising temperatures and low immunity to new strains. But one group of scientists is rolling out trials to breed dengue-resistant bugs in a bid to tackle one of the world's leading mosquito-borne illnesses, raising hopes the disease can finally be beaten.