"For the first time in more than 65 years, dengue has returned the continental United States, according to an advisory the Centers for Disease Control and Prevention issued in late May. While a few cases were reported earlier, they were primarily in Americans who had caught the virus abroad or at the Texas-Mexico border.
The upsurge is not unexpected. Experts say more than half the world's population will be at risk by 2085 because of greater urbanization, global travel and climate change. Over the past 30 years, a global outcry against using the pesticide dichlorodiphenyltrichloroethane, or DDT, has led to the resurgence of the mosquito, a voracious consumer of human blood and carrier of infectious disease."