 There is a public health emergency in the United States as cases of dengue fever soar. As of May, there have been 49 states with reported cases, including in North Carolina. Now all have confirmed cases. Dr. Carl Spears, a physician with Mission MyCare Now, tells NCN News. Avoid times of day when mosquitoes are most prevalent, and that's dusk and dawn, the twilight hours when mosquitoes are very prevalent.