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乙型肝炎疫苗的普遍应用，为大规模预防和控制乙型肝 炎病毒（ＨＢＶ）感染提供了安全有效的手段，但接种疫苗若 干年以后仍有部分转为ＨＢｓＡｇ（＋），为此，我们对已接种乙 肝疫苗的小儿进行加强接种，并对其免疫效果进行了监测，现报告如下。 １资料和方法 １．１对象为我
The universal application of hepatitis B vaccine has provided a safe and effective method for large-scale prevention and control of hepatitis B virus (HBV) infection. However, some vaccines have been converted to HBsAg (+) after some years. Therefore, Hepatitis B vaccine has been vaccinated children to strengthen vaccination, and the immune effect was monitored, are as follows. 1 data and methods 1.1 object for me