What Is  Japanese Encephalitis?
In case of Japanese Encephalitis (JE), mosquitoes of the Culex vishnui subgroup are the chief vectors which primarily use outdoor resting in vegetation, other shaded places and paddy fields for breeding, mostly in rural areas. These vectors generally feed on cattle, though human and pig feeding is also recorded in some areas.

In the cities Culex vishnui subgroup mosquitoes will hardly get places like these. The number of water bodies in cities is far less and even chances of migratory birds (which disperse ticks infected with the virus) visiting these places are quite bleak, he said. But encephalitis has a chance to make an impact on the outskirts of the city and places like Howrah and Hooghly where there are ample places for the vectors to survive.