World Dengue Day 2026

"One World Against Dengue"

World Dengue Day is observed each year on 15 June to raise awareness of dengue, a neglected tropical disease and one of the fastest-spreading infectious conditions worldwide.

Key facts about dengue

• Dengue is a viral infection caused by the dengue virus (DENV), which is transmitted to humans through the bite of infected mosquitoes.
• Approximately 5.6 billion people, more than half of the world's population, are at risk of dengue, with an estimated 100–400 million infections occurring each year.
• Dengue is mainly prevalent in tropical and sub-tropical climates worldwide, particularly in urban and semi-urban settings, but is currently expanding to temperate areas.
• While many DENV infections are asymptomatic or cause only mild illness, some can progress to severe dengue and even result in death.
• Prevention and control of dengue primarily rely on vector control. Although there is no specific treatment for dengue or severe dengue, early detection and access to appropriate medical care significantly reduce the risk of severe outcomes and death.