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为了解学龄前儿童乙肝感染情况，我们进行了3年连续的调查。方法：用反向被动血凝集法测HBSAg，滴度卫1：6为阳性。肝功，用赖氏法。凡本所查出HBSAg（＋）后，儿童应在1～2周内加做乙肝5项及肝功，以确诊。对象：收集1994年、1995年、1996年体检的1～8岁儿童体检的肝功资料。
To understand the hepatitis B infection in preschool children, we conducted a 3-year continuous survey. Methods: HBSAg was measured by reverse passive hemagglutination. The titer of 1: 6 was positive. Liver function, with Lai’s method. Where the Institute detected HBSAg (+), children should be added within 1-2 weeks of hepatitis B and liver 5, to confirm. PARTICIPANTS: The liver function data of children aged 1 ~ 8 years who were in 1994, 1995 and 1996 physical examination were collected.