Fig. 1

Flow chart of study subjects. This figure illustrates the flow of study subjects. 1,565 were screened, of whom 442 were invited for follow-up. There were only 145 subjects enrolled in follow-up. One hundred and one pregnant women delivered at the study hospitals, while another 44 pregnant women delivered in other hospitals. Finally, 116 infants were followed-up at six-month-old, of whom 35 infants were born to HBsAg positive mothers. ANC, antenatal care; HBsAg, hepatitis B surface antigen; HBV, hepatitis B virus; MTCT, mother-to-child transmission