流行性乙型脑炎(以下简称乙脑)是由病毒引起、蚊子传播的中枢神经系统急性传染病。流行于夏秋季节,多发生于儿童,以突然高热、头痛、呕吐、惊厥以及嗜睡、昏迷等神志障碍为其主要特点。病死率比较高。部分病人有后遗症。此病对人民危害很大,应积极防治。 Japanese encephalitis (hereinafter referred to as JE) is an acute infectious disease of the central nervous system caused by a virus and transmitted by mosquitoes. Popular in summer and autumn, occurred in children, with sudden high fever, headache, vomiting, convulsions and lethargy, coma and other psychiatric disorders as its main features. Fatality is relatively high. Some patients have sequelae. The disease is very harmful to the people and should be actively controlled.