A new vaccine to prevent dengue may be on the horizon. And health officials say it's desperately needed. The World Health Organization this year listed dengue as one of the top 10 threats to global health. There's no specific treatment for the viral disease. When outbreaks occur, local clinics can get overwhelmed with patients experiencing severe flu-like symptoms. Third, the disease is moving in to new areas as the mosquitoes that carry the dengue virus expand their range. The Aedes aegypti mosquito basks in warm, wet, tropical areas, and shifting global temperatures have made more places to its liking.