Kevin Flores, 11, remains under a mosquito net while being treated for dengue fever at La Mascota hospital in Managua, Nicaragua, last fall. Inti Ocon/AFP/Getty Images hide caption itoggle caption Inti Ocon/AFP/Getty Images Shots - Health News Dengue Fever 101: How Serious Is This Disease? May 30, 2014 The odds are that a victim will recover. But the mosquito-borne virus can be incredibly painful. It's also a growing health concern around the globe and has even been spotted in the United States.