地鼠肾细胞培养流行性乙型脑炎灭活疫苗(下简称乙脑疫苗),经多年使用证明是安全有效的。但由于流行性乙型脑炎是自然疫源性疾病,影响发病率的因素较多,所以观察疫苗效果相当困难;血清学效果也因不同地区隐性感染率的影响而报告不一。1979年在原疫苗生产工艺的基础上,采取降低感染病毒量 Hamster kidney cell culture inactivated Japanese encephalitis inactivated vaccine (hereinafter referred to as JE vaccine), after years of use proved to be safe and effective. However, since Japanese encephalitis is a naturally foci disease and affects many morbidities, it is very difficult to observe the effect of the vaccine. The serological effects are also reported differently due to the influence of the latent infection rates in different regions. In 1979 on the basis of the original vaccine production process, to reduce the amount of infectious virus