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保定市流脑呈每9年1次的规律性周期性大流行,1950年以来,分别于1957、1966、1975年出现三次流脑大流行,按此规律预测,1984年亦将出现。为了阻止大流行的出现,从1980年开始,对全市1～15岁儿童进行分区轮种流脑 A 群多糖菌苗(北京生物制品研究所生产),至1984年度止,进行了两遍轮种,接种两次的儿童100,097名,按种率为80.01%.以已接种者作免疫组,来接种者为对照组,结果,免疫组389,866人,发病3人,发病率为0.77/10万,对照组216,276人,发病17
Baoding meridian was regular cyclical pandemic once every nine years. Since 1950, three epidemonectic outbreaks occurred in 1957, 1966 and 1975, respectively. According to this law, it will also appear in 1984. In order to stop the outbreak of the pandemic, from 1980 onwards, the city’s 1 to 15-year-old children were partitioned round of cerebrospinal meningitis group A polysaccharide vaccine (Beijing Institute of Biological Products) until 1984, conducted two rounds of rotation , 100,097 children were inoculated twice, with the rate of 80.01% .According to the vaccinated group, 389,866 were immunized group, the incidence was 3, the incidence rate was 0.77 / 100000, Control group 216,276 people, the incidence of 17