为了解甲肝发病规律,掌握流行趋势,探索预防甲肝更有效的措施,降低发病,现将结果报告如下。1　资料来源和方法根据1991～1998年疫情年报及报告片卡,对每张卡片均进行调查,核实和检诊。人口资料由区公安部门提供。采用逐年统计分析法。2　结果21　发病趋势　据甲肝疫情报告统计, To understand the pathogenesis of hepatitis A, master the trend, to explore more effective measures to prevent hepatitis A, reduce the incidence, the results are reported as follows. 1 Sources and Methods According to the annual report and the report card of the epidemic from 1991 to 1998, each card was investigated, verified and examined. Population information provided by the district public security department. Using year by year statistical analysis. 2 results 21 incidence trends According to hepatitis A epidemic report statistics,