Dengue fever is a tropical disease that is borne by mosquitoes. It is caused by the dengue virus. Typical symptoms include high fever, vomiting, headache, joint pains, muscle pains and a typical skin rash. Symptoms start to show 3 to 14 days after the body is infected. Recovery consumes under 2 to 7 days. In a small percentage of cases, the dengue disease progresses into a potentially fatal condition called dengue haemorrhagic fever. This results in bleeding, leakage of blood plasma, low count of platelets, or into a dengue shock syndrome in which an extremely low blood pressure happens.

The dengue virus is spread by many species of the Aedes mosquito, chiefly the Aedes aegypti. There are 5 different types of this virus. Infection with one of the types provides lifetime immunity to that type. However, infection with the other types gives immunity only for the short-term. Successive infection with a different type of virus raises the risk of serious complications. Various tests exist to diagnose this disease. One test includes sensing antibodies to the virus or its RNA.