Dengue infection is transmitted from one person to other by the bite of an infected female Aedes mosquito. Dengue fever (DF) is a viral infection caused by any of the four types of dengue virus (DENV-1 to DENV-4). Aedes aegypti is the commonest vector of dengue fever. Other Aedes species which can also act as potential vectors are Ae. Albopictus, Ae. Polynesiensis and Ae. Niveus. In India, the potential vectors are Aedes aegypti (the main vector in most urban areas) and Aedes albopictus (vector in few areas of southern India). [Read: Genetics of Dengue Fever]
The Aedes mosquito: The Aedes mosquito (vector of dengue fever) becomes infected after biting an infected person. The dengue virus spreads when the infected mosquito bites a healthy person. To get one full blood meal, the mosquito bites several persons, and infects all of them. The mosquito remains infected for the rest of its life and can transmit the infection to its progeny of mosquitoes through eggs ( transovarial transmission).
Some facts about the Aedes mosquito
[Read: Symptoms of Dengue Fever]
Feeding Habit of Aedes mosquito
Potential Breeding Sites for Aedes mosquitoes
The Aedes mosquito breeds in water collections in and around human living areas (households, construction sites and factories) such as:
The female mosquito lays eggs in these man-made water receptacles in and around your house and neighbourhood. The female mosquito lays eggs three times in its lifespan and each time it lays about 100 eggs. If the surrounding and atmosphere are compatible, the eggs develop into adult form in as short as seven days. But in low temperatures, it may take several weeks to become an adult. [Read: Treatment of Dengue Fever]
Dengue fever is a major public health problem in several parts of the world. As there is no specific treatment for dengue, prevention has an important part in control of dengue fever. Major focus on prevention centres on avoiding mosquito bites and controlling and eliminating mosquito breeding sites.