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射阳县是病毒性肝炎（以下简称肝炎）高发地区之一，为分析学生肝炎发病规律，加强学生肝炎的控制，对射阳县中小学生肝炎发病情况进行了调查，结果如下。1对象与方法1．1对象：为1990－1997年全县所有在校的中、小学生，累计达1202676人。1．2资料：监测资料来源于传染病报告?
Sheyang County is one of the areas with high incidence of viral hepatitis (hereinafter referred to as hepatitis). In order to analyze the regularity of hepatitis in students and to strengthen the control of hepatitis, the incidence of hepatitis in primary and secondary school in Sheyang County was investigated. The results are as follows. 1 objects and methods 1.1 object: for the years 1990-1997 all county school primary and secondary students, a total of 1202676 people. 1.2 Data: monitoring data from infectious disease reports?