森林脑炎,又名春夏季壁虱脑炎,是一种地区性和季节性的传染病。本病最初发现於苏联远东森林地带,在1935—1936年开始有记载。当时由於苏联建设事业的发展,在远东戡测和建造铁路,采伐森林,在这些人烟稀少地区建筑了住宅,人们定居下来,当春夏季节,建筑者突然发生了一种以往谁都不认识的重病,病后有麻痹症状出现,有些病例甚至很快死亡。於是引起了苏联政府的重视,在1937—1939年苏联保健部组织了调查团,进行了全面的调查研究。由专家们对本病的各方面作了综合性的报导,并命名为“森林脑炎”。病原和流行病学本病的病原体是滤过性病毒,大小约为20 Forest encephalitis, also known as spring and summer tick encephalitis, is a regional and seasonal infectious disease. The disease was first discovered in the Soviet Union Far East forest zone, recorded in 1935-1936. At that time, due to the development of Soviet Union construction, in the Far East, railroads and deforestation were deforested and houses were built in these sparsely populated areas where people settled down. In spring and summer, builders suddenly developed a serious illness that no one knew before After the illness, paralysis symptoms appear, and some cases even die quickly. So attracted the attention of the Soviet government, in 1937-1939 the Soviet Union Ministry of Health organized a survey mission conducted a comprehensive investigation and study. Experts from all aspects of the disease made a comprehensive report, and named “forest encephalitis.” Pathogens and Epidemiology The pathogen of the disease is a viral virus of approximately 20 in size