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日本自1954年开始使用日本脑炎疫苗以来,病毒消长及发病人数均发生很大变化。 1967年前每年发病1000～3000人,1968年开始显著下降至100～50人,甚至降到原来发病人数的1/10。1976～1978年全国范围
Since Japan began using Japanese encephalitis vaccine in 1954, there has been a great change in the rate of increase or decrease of the virus. Before 1967 the annual incidence of 1000 to 3000 people, 1968 began to drop significantly to 100 to 50 people, or even down to the original number of patients 1 / 10. 1976 to 1978 nationwide