One may argue that global climate change will be associated with large areas of drought, thus Aedes aegypti will not have sufficient water in which to breed. Paradoxically, this mosquito thrives both in wet and dry climates. In dry areas, people store water in their homes. The mosquito is domestic and breeds readily in cisterns and water storage jars. Yellow fever is a febrile hemorrhagic disease characterized by hepatic and renal failure.
Dengue is usually a nonfatal illness with fever, rash, and protracted malaise.
A severe form of dengue with hemorrhagic fever and shock syndrome is described principally in persons suffering a second infection with a different serotype. An effective vaccine is available for yellow fever, but there is no specific preventive immunization for dengue. Aedes aegypti mosquitoes are prevalent in the southern United States as far north as latitude 35deg. N. Temperature is a factor limiting northward spread. This species thrives in both wet and dry climates.