Dengue fever is a severe, flu-like illness that affects infants, young children and adults, but seldom causes death. It is transmitted by the bite of a mosquito infected with one of the four dengue virus serotypes.

Dengue is the fastest growing mosquito-borne disease across the world today, causing nearly 400 million infections every year.

In the last 50 years, dengue has spread from being present in a handful of countries to being endemic in 128 countries; dengue incidence has increased 30-fold in this time period. Dengue is endemic in all states and union territories (UTs) of India. In 2015, a total of 99 913 dengue cases and 220 deaths were reported from 35 states and UTs.

Ae. aegypti is the main vector in most of the urban areas. Ae. albopictus is also found as vector in few areas of southern and eastern India.