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1 流行特征44年(53～96)共发生68062例,死亡2410例,病死率3.54%,发病率最低0.11/10万,最高7622.16/10万。1.1 周期性流行将流行强度划分为:①散发,发病率在20/10万以下;②中、小流行,发病率在20～100/10万;③大流行,发病率在100/10万以上。44年中达大流行水平有12年;达中、小流行水平的有11年;其余21年为散发。
1 epidemic characteristics 44 years (53 ~ 96) a total of 68062 cases, 2410 deaths, the mortality rate of 3.54%, the lowest incidence of 0.11 / 100000, the highest 7622.16 / 100000. 1.1 cyclical prevalence intensity will be divided into: ① distribution, the incidence of 20/10 million or less; ②, small and medium-sized epidemic, the incidence of 20 to 100 / 100,000; ③ pandemic, the incidence of 100 / 100,000 or more . In the 44 years, the level of pandemic reached 12 years; it reached 11 years in middle and small epidemic levels; and the remaining 21 years were distributed.