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流行性乙型脑炎是发生在每年夏秋之同的一种急性流行性的传染病,病原是嗜神经性的滤过性病毒,传染媒介是蚊子,在北京一带地区是以黑斑蚊为主,家蚊亦可传布。蚊虫咬了得病的人或生病的动物如狗、马、牛等,就把病人或病畜血液中的一种滤过性病毒吸入蚊体内,再咬健康的人就能被病毒传染而生病。此病的主要病变见于脑及脊髓,软脑膜充血,大脑、小脑、延髓及脊髓内神经细胞的损坏或变性改变形成脑软化,被害的细胞是广泛性
Epidemic encephalitis is an acute epidemic of infectious diseases that takes place in the summer and autumn of each year. The pathogen is a neurotropic viral virus. The vector is mosquito. The area is dominated by black mosquitoes in Beijing Family mosquitoes can be spread. Mosquitoes bite sick people or sick animals such as dogs, horses, cattle, etc., the patient or sick animals in the blood of a viral inhalation mosquito, and then bite healthy people can be infected by the virus and become sick. The main lesion found in the brain and spinal cord, pia mater congestion, brain, cerebellum, medulla oblongata and nerve cell damage or degeneration to change the formation of brain softening, the victim cells are widespread