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新生儿乙型肝炎 (乙肝 )疫苗免疫 ,从1 991年开始在城市的全面实施至今已经九年。在免疫的儿童中 ,ＨＢｓＡｇ的携带率有明显下降。为了解 2～ 6岁儿童普种乙肝疫苗的效果 ,于 1 999年 4月我们对华北石油综合九处幼儿园 2～ 6岁儿童进行了乙肝疫苗免疫情况的调查。对象与方法1?
It has been nine years since the full implementation of the newborn hepatitis B (hepatitis B) vaccine in the city since 1991. In immunized children, HBsAg carrier rate decreased significantly. To understand the effect of universal hepatitis B vaccine for children aged 2 ~ 6 years, we conducted a survey on hepatitis B vaccine immunization against children aged 2 ~ 6 years in North China Petroleum Comprehensive 9 kindergartens in April 1999. Object and method 1?