Dengue fever
There are 50–100 million dengue virus infections annually. Dengue fever is usually not fatal, but infection with one of four serotypes can increase later susceptibility to other serotypes, resulting in a potentially fatal disease called severe dengue. Dengue fever is caused by a flavivirus, and is spread mostly by the bite of the "Aedes aegypti" mosquito. No treatment for either dengue or severe dengue exists beyond palliative care. The symptoms are high fever and flu-like symptoms. It is found in Asia, Latin America, and Northern Australia.