Dengue fever is a mosquito-borne tropical disease caused by dengue virus. It is frequently asymptomatic; if symptoms appear they typically begin 3 to 14 days after infection. These may include a high fever, headache, vomiting, muscle and joint pains, and a characteristic skin itching and skin rash.
Those who become infected with the virus a second time are at a significantly greater risk of developing severe disease. Symptoms are high fever, rash, and muscle and joint pain. In severe cases there is serious bleeding and shock, which can be life threatening. Treatment includes fluids and pain-relievers. Severe cases require hospital care.