Dengue fever may be a mosquito-borne tropical disease caused by the dengue virus. Symptoms typically begin three to 14 days after infection. These may include a high fever, headache, vomiting, muscle and joint pains, and a characteristic rash. Recovery generally takes two to seven days. during a small proportion of cases, the disease develops into severe dengue, also referred to as dengue haemorrhagic fever , leading to bleeding, low levels of blood platelets and plasma leakage, or into dengue shock syndrome, where dangerously low vital sign occurs. Dengue is spread by several species of female mosquitoes of the Aedes type, principally A. aegypti. The virus has five types; infection with one type usually gives lifelong immunity thereto type, but only short-term immunity to the others. Subsequent infection with a special type increases the danger of severe complications. variety of tests are available to verify the diagnosis including detecting antibodies to the virus or its RNA.