Those with nonprotective titers (<10 mIU/mL) received a booster dose. We similarly followed 16 children of hepatitis B surface antigen (HBsAg)-positive mothers. Results: Of low risk infants ...

Of the 102 children (group 1a) who had received 3 doses of a plasma-derived hepatitis B vaccine as infants, 42 (41%) had anti-HBs titers ≥10 mIU/mL at 8.9 years of age ( Table 1). All were ...