Japanese encephalitis is a mosquito-borne disease caused by the Japanese encephalitis virus. The virus is principally transmitted by the bites of infected mosquitoes. The principal type of mosquito that transmits the disease is called Culex tritaeniorhynchus. The disease occurs mainly in the rural and agricultural areas of Asia and the Western Pacific Region.
Symptoms usually start at around 4 – 14 days after being infected. Most infections occur without apparent symptoms or with mild symptoms such as fever with headache. More severe infection is characterised by rapid onset of headache, high fever, neck stiffness, impaired mental state, coma, tremors, convulsions (especially in children) and paralysis.
To prevent contracting the disease, members of the public should take general measures to prevent mosquito bites and avoid going to rural areas from dusk till dawn when the mosquitoes spreading this virus are most active.
For details, please refer to the factsheet of Japanese encephalitis