Dengue is transmitted to humans through the bite of certain species of Aedes mosquitos that carry one of the virus’s four serotypes: dengue viruses 1–4.
These mosquitos mostly inhabit subtropical and tropical places worldwide, including some hot, humid parts of the United States.Globally, dengue is commonplace in more than 100 countries, with 40% of the world’s population living in at-risk areas.
Outbreaks of the disease are a significant health problem in the Caribbean, Africa, the Pacific Islands, Southeast Asia, the Americas, and the Middle East.Approximately 400 million individuals worldwide contract dengue each year.