Fig. 2From: A booster hepatitis B vaccine for children with maternal HBsAg positivity before 2 years of age could effectively prevent vaccine breakthrough infectionsThe anti-HBs levels at the previous timepoint of VBIs detection in the nonbooster group. (A) The anti-HBs level before VBIs detection at 2 years of age. (B) The anti-HBs level before VBIs detection at 3 years of age. (C) The anti-HBs level before VBIs detection at 5 years of ageBack to article page