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为了解我市区学龄前儿童HBsAg携带情况,以便制订相应的防治措施,于1985年7～12月对市区642名学龄前儿童进行HBsAg携带率的调查,现将结果报告如下: 材料与方法
In order to understand the situation of carrying HBsAg among preschool children in our city in order to formulate corresponding prevention and control measures, we conducted a survey on the carrying rate of HBsAg among 642 preschool-aged children in urban areas from July to December in 1985, and the results are reported as follows: Materials and Methods