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郑州市１９９３～１９９７年共发生甲肝９３４１例，乙肝１７１２９例，有如下特点：①甲肝发病率及在病毒性肝炎中的构成比由１９９３年的４６．２６／十万和４０．１６％降至１９９７年的１７．０１／十万和２０．２６％，而乙肝由１９９３年的５５．７６／十万和４８．２４％升至１９９７年的６０．５２／十万和７２．０６％；②甲肝市区发病率呈明显下降趋势，农村发病率呈波动变化；乙肝市区发病率稳定在较高状态，农村地区发病率呈明显上升趋势；③甲肝主要发生于１４岁以下儿童，占甲肝总数的６０．１０％，乙肝主要发生于２５～２９岁年龄组，占乙肝总数的５１．５０％。④甲肝以秋末冬初季节为发病高峰，乙肝无明季节性
There were 9,341 cases of hepatitis A and 17,129 cases of hepatitis B in Zhengzhou from 1993 to 1997. They had the following characteristics: ① The incidence of hepatitis A and the composition in viral hepatitis were reduced from 46.26 / 100,000 and 40.16% in 1993 17.01 / 100,000 and 20.26% in 1997, while that of hepatitis B increased from 55.76 / 100,000 and 48.24% in 1993 to 60.52 / 100,000 and 72.06% in 1997; The incidence of hepatitis A in urban areas showed a significant downward trend, and the incidence of rural areas fluctuated. The incidence of hepatitis B in urban areas was stable at a high level, and the incidence in rural areas showed a clear upward trend. The incidence of hepatitis A mainly occurred in children under 14, accounting for the total number of hepatitis A Of 60.10%, hepatitis B occurs mainly in the 25-29 age group, accounting for 51.50% of the total number of hepatitis B. ④ hepatitis A early autumn season for the peak incidence, hepatitis B no obvious seasonal