Killer Virus (Dengue): How does Dengue Spread?

Dengue is a mosquito-borne disease caused by 4 different virus types, DENV 1-4 and spread by Aedes mosquito. It is related to the viruses that caused West Nile infection and Yellow Fever. Dengue fever is painful and it has become one of the worst nightmares across the country.

How does Dengue spread?

Aedes Mosquitoes

Dengue is spread by the bite of the Aedes mosquito. Aedes mosquito is a small, dark mosquito with white bands on its legs. It use natural locations or habitats to lay their eggs. Aedes lay eggs in water containing organic material for e.g., decaying leaves, and algae during the day time.

Aedes mosquitoes prefer containers with wide openings and dark coloured containers that are in shade to lay their eggs. The life duration for Aedes adult mosquitoes is about 3 weeks. Dengue is mostly a monsoon virus because the Aedes mosquitoes do not remain alive through the winter in colder climates.

Standing Water

Water that stops flowing is generally not considered to be dangerous, however; it can cause major risks to health such as the Dengue virus. Standing water can be found in almost every place and at any time of the year. Water is an important element to the mosquito’s life.

Standing Water at home

Aedes mosquitoes are also known as container breeding mosquito. Aedes mosquito breeds mostly in water collection in artificial containers. These mosquitoes prefer to lay eggs in water that are stored in manmade containers. Eggs stick to the containers like a gum until they are cleaned off.


A pond, natural or artificial is a form of standing water. Ponds can become a breeding ground for the mosquitoes that spreads dengue. Mosquitoes lay eggs where they find still water. Grass clippings and leaves present in ponds supply foods to these mosquitoes to survive.

Water in Tyres

Inappropriately stored tyres can develop into breeding grounds for thousands of mosquitoes. Tyre is one of the important habitats for mosquitoes. Tyres filled with water are insulated and hold heat for a long time that helps mosquitoes in growth and speeds up egg hatching. Moreover, tyres containing water collects leaves that offer nutrition for mosquitoes.

Construction Sites

Canvas sheets are used to cover construction materials from rain water may give rise to mosquito breeding. Water puddles on the floor and tanks left uncovered raise the mosquito breeding.

Aedes mosquitoes mainly lay eggs in clean and stagnant water collections. The eggs can survive up to 8 months after the water in the containers is dried out.


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