[A study on distribution characteristics of viral hepatitis and preventive strategy in Hangzhou]

By using the method of predictive survey, 1248 cases of acute viral hepatitis, which have been definitely diagnosed, in urban district, water-net areas, semi-mountainous and mountainous areas in Hangzhou were studied for the epidemiology and serum pathogenic typing in 1987. As a result, with the mixed infection of hepatitis A and hepatitis B at the rate of 1.20%, hepatitis A 69.71%, hepatitis B 7.13% non A non B hepatitis amounted to 21.96%. In urban and rural area, the percentage of hepatitis A ranked first while that non A non B hepatitis did second. The main risky factors in epidemicity of hepatitis A were: 1) the use of commode; 2) contact with the patients with hepatitis; 3) drinking unboiled water. Hepatitis A and hepatitis B transmitted mainly in the way of extra-intestines. Seeing dentist was the main risky factor. The relevant strategy was presented on the bases of the above-mentioned data.