Virology department-in-charge at the facility Dr Nemai Bhattacharya said, "Kolkata has little chances of being infected by the encephalitis virus. It is mostly a rural disease."
Bhattacharya said the rate of its incidence in rural areas was higher because of the environmental factors there.
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, according to Bhattacharya.
These vectors generally feed on cattle, though human and pig feeding is also recorded in some areas, he said.
"Commonly they breed in water with luxuriant vegetation mainly in paddy fields and the abundance is related to rice cultivation, shallow ditches and pools," he explained.
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," the doctor said.

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