The infection: Dengue is caused by four types of the dengue virus, which are spread by Aedes aegypti spirit Aedes albopictus mosquitoes.
Its threat potential: The reported incidence of Dengue has increased dramatically over the past two decades, and regular outbreaks have been documented in previously unestablished areas of Europe and the Americas. A vaccine does exist, but it is not recommended for people who have not been infected before, since it may raise the risk of severe dengue in those never exposed to any type of the virus.
Symptoms and treatment: About a quarter of victims will experience symptoms, which include fever, muscle aches, eye pain, and rashes. Surviving one type of dengue infection will not confer protection to the others, however, and a second infection increases the risk of a severe, life-threatening illness that can kill within hours.