How Japanese Encephalitis is transmitted?

The JE virus is transmitted from animals, birds, pigs, particularly the birds belonging to family Ardeidae (eg. Cattle egrets, pond herons etc.) to man by Vishnui group Culex mosquito. Pigs play an important role in the natural cycle and serve as an amplifier host since they allow virus multiplication manifold without suffering from disease and maintain prolonged high level viraemia. Due to prolonged viraemia, mosquitoes get opportunity to get infected from pigs easily. Man is a dead-end host in transmission cycle due to low and short-lived viraemia. Mosquitoes do not get infection from JE patient. There is no human to human transmission of JE.