Mosquitoes are re-emerging as a serious North American health threat as carriers of the West Nile Virus. In the developing world, mosquitoes pose an even more menacing danger. There, they transmit malaria, the deadliest disease borne by any insect or animal anywhere. This year, malaria deaths are expected to spike upwards, after more than a decade of steady decline. The reason: Ebola. The fragile health systems in West Africa have been stretched to the limit in the Ebola fight, and routine measures to combat malaria have gone by the wayside.