Japanese encephalitis virus (JEV)is one of the important causes of viral encephalitis worldwide,of which the disease rate is about 50000 patients per year,and about 15000 patients died.

• 流行性乙型脑炎病毒是在世界范围内引起病毒性脑炎的重要原因之一,每年乙脑的发病约50000例,其中15000例死亡。