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http://www.webmd.com/a-to-z-guides/dengue-fever-reference#1

An estimated 390 million dengue infections occur worldwide each year, with about 96 million resulting in illness. Most cases occur in tropical areas of the world, with the greatest risk occurring in:

The Indian subcontinent
Southeast Asia
Southern China
Taiwan
The Pacific Islands
The Caribbean (except Cuba and the Cayman Islands)
Mexico
Africa
Central and South America (except Chile, Paraguay, and Argentina)

Symptoms of Dengue Fever

Symptoms, which usually begin four to six days after infection and last for up to 10 days, may include

Sudden, high fever
Severe headaches
Pain behind the eyes
Severe joint and muscle pain
Fatigue
Nausea
Vomiting
Skin rash, which appears two to five days after the onset of fever
Mild bleeding (such a nose bleed, bleeding gums, or easy bruising)

Sometimes, symptoms are mild and can be mistaken for those of the flu or another viral infection. Younger children and people who have never had the infection before tend to have milder cases than older children and adults. However, serious problems can develop. These include dengue hemorrhagic fever, a rare complication characterized by high fever, damage to lymph and blood vessels, bleeding from the nose and gums, enlargement of the liver, and failure of the circulatory system. The symptoms may progress to massive bleeding, shock, and death. This is called dengue shock syndrome (DSS).

People with weakened immune systems as well as those with a second or subsequent dengue infection are believed to be at greater risk for developing dengue hemorrhagic fever.