８０年代后期江苏省病毒性肝炎发病强度急剧上升。调查表明，高强度的肝炎发病是由甲型肝炎（甲肝）流行所造成。其特征是，每年３～５月份出现甲肝发病高峰（春峰），其发病数可占全年发病数的３１．３４％～４４．９４％。其主要原因是，人群甲肝抗体水平低下，大量易感人群? In the late 1980s, the incidence of viral hepatitis in Jiangsu Province increased sharply. Investigation shows that the incidence of high-intensity hepatitis is caused by the hepatitis A (hepatitis A) epidemic. Its characteristic is that every year from May to May peak incidence of hepatitis A (Chunfeng), the incidence can account for the annual incidence of 31.34% to 44.94%. The main reason is that people with low levels of hepatitis A antibodies, a large number of susceptible populations?