(N/A) Diseases like malaria and filariasis are transmitted through insect vectors.
The most important measure is to control or eliminate the vectors and their breeding places.
This can be achieved by avoiding the stagnation of water in and around residential areas.
Regular cleaning of household coolers,use of mosquito nets,introducing fishes like $Gambusia$ in ponds that feed on mosquito larvae,and spraying of insecticides in ditches,drainage areas,and swamps are effective methods.
In addition,doors and windows should be provided with wire mesh to prevent the entry of mosquitoes.
Such precautions have become all the more important,especially in light of the recent widespread incidences of vector-borne diseases (transmitted by $Aedes$ mosquitoes) like dengue and chikungunya in many parts of India.