我们自1987～1989年对72例HBsAg阳性的家族进行了调查,其中两代的家庭(小家庭)65户,三代的家庭(大家庭)7户,均以直系亲属为主。现将调查情况报告如下。 We surveyed 72 HBsAg-positive families from 1987 to 1989, of which 65 were two-generation families (small families) and 7 were three generations of families (large families), most of whom were immediate relatives. Now the investigation report as follows.