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１引言 我国是乙型肝炎的高发地区，乙型肝炎病毒（ＨＢＶ）传播极其广泛。１９９４年至１９９９年静安区防疫站在学生中大力推广乙型肝炎疫苗预防接种，有效地阻断了乙型肝炎病毒（ＨＢＶ）的传播，使青年学生的ＨＢＶ感染率逐年下降。现将有关调查资料报告如下。２临床资料２
1 Introduction China is a high incidence of hepatitis B, hepatitis B virus (HBV) spread an extremely wide range. From 1994 to 1999, Jing’an District Epidemic Prevention Station vigorously promoted the hepatitis B vaccination among students, effectively blocking the spread of Hepatitis B virus (HBV) and making the youth HBV infection rate declining year by year. Now the investigation report is as follows. 2 clinical data 2