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为了评价北京市学龄前儿童乙型肝炎（乙肝）疫苗接种率及免疫效果，分别于1993、1996、1997年采用世界卫生组织推荐的组群抽样法，对0～5岁儿童的接种情况进行了3次调查。结果显示，我市学龄前儿童乙肝疫苗接种率已达到91.52％～99.32％，免疫后的抗体阳转率为75.85％～84.40％，该人群的HBSAg携带率降至0.5％以下．校免疫前该人群HBSAg携带率下降了90.44％．本次调查说明本市学龄前儿童的乙肝疫苗接种率已处于较高水平，其免疫效果理想．
In order to evaluate the vaccination rate and immune effect of hepatitis B (hepatitis B) in preschool children in Beijing, the group sampling method recommended by the World Health Organization was used in 1993, 1996 and 1997 respectively to inoculate children aged 0-5 years 3 surveys. The results showed that the vaccination rate of hepatitis B vaccine reached 91.52% -99.32% in preschool children in our city, the positive rate of antibody positive immunization was 75.85% -84.40%, and the HBSAg carrier rate in this population was reduced to below 0.5%. Before school immunization, the population HBSAg carrier rate decreased by 90.44%. The survey shows that the city’s pre-school children’s hepatitis B vaccination rate has been at a high level, the immune effect is ideal.