Dengue fever is an infectious tropical disease that is caused by the dengue virus and transmitted by mosquitoes. Symptoms of dengue fever, also called breakbone fever, are headache, muscle ache, fever, and a measle-like rash. Incidence of dengue fever has dramatically increased since the 1960's, infecting hundreds of millions of people yearly, making it "the most important mosquito-borne viral pathogen affecting humans today," according to IDAMS.
This map was developed by IDAMS: the International Research Consortium on Dengue Risk Assessment, Management, and Surveillance. This group is a conglomerate of international experts that work together to improve the diagnosis and management of dengue fever. In order to accomplish this, IDAMS focuses on the creation of new and innovative tools to control dengue fever on a global scale.
This map displays the global probability of occurrence for dengue fever in 2010. Ranging from 0 in white to 100% in dark red. For example, a 20% probability of occurrence means that the likelihood that someone in the 5 sq km region will contract dengue within the year is 20%. We can see that there are many places throughout the world with high probability of dengue fever. Using models, IDAMS estimates that there are 390 million cases of dengue each year which is 3 times that previously estimated. Of the 390 million cases, only 100 million are symptomatic while the remaining are estimated inapparent. The inapparent cases, or the cases that have no symptoms, are a large piece to the transmission of the disease and an important part of the story behind the global distribution of dengue fever.