Dengue is spread by several species of mosquito of the Aedes type, principally A. aegypti.[1] The virus has five different types;[3] infection with one type usually gives lifelong immunity to that type, but only short-term immunity to the others. Subsequent infection with a different type increases the risk of severe complications.[1] A number of tests are available to confirm the diagnosis including detecting antibodies to the virus or its RNA.[2]