Dengue is a viral infection transmitted primarily by Aedes mosquitoes, especially Aedes aegypti. It is prevalent in tropical and subtropical regions around the world. The virus has four distinct serotypes (DENV-1, DENV-2, DENV-3, DENV-4).

Symptoms of dengue include high fever, severe headache, pain behind the eyes, joint and muscle pain, rash, and mild bleeding (e.g., gums or nose). In severe cases, it can lead to dengue hemorrhagic fever or dengue shock syndrome, which can be life-threatening.

There is no specific antiviral treatment, but early detection and proper medical care can significantly reduce mortality rates.