All infants were followed up for the hepatitis B detection at the age of 0,3,6,9,12,24 months by enzyme-linked immunoadsorbent assay(ELISA).

• A、B两组婴儿都分别在0、3、6、9、12、24月龄静脉采血,用酶联免疫吸附试验(ELISA)检测HBV标志物,同时随访。