Telbivudine treatment started in early and middle pregnancy completely blocks HBV vertical transmission

Background: To evaluate the efficacy and safety of treating HBV-positive mothers with telbivudine in early and middle pregnancy to prevent mother-to-infant HBV transmission. Methods: The subject population comprised pregnant women with chronic hepatitis B (CHB; n = 188) from January 2013 to June 2015, with HBV DNA >= 1.0 x 10(7)copies/mL and increased alanine aminotransferase levels. Groups A (n = 62) and B (n = 61) were treated with telbivudine starting at 12 weeks or 20-28 weeks after gestation, respectively. Telbivudine was discontinued at postpartum 12 weeks. Group C (n = 65) received no antiviral. All infants were vaccinated with hepatitis B immunoglobulin (200 IU) and HBV vaccine (20 with hepatitis B The maternal HBV DNA levels of the groups were compared. Mother-to-infant transmission of HBV was indicated by the presence of HBsAg in infants 7 months after birth. Results: Before treatment, the HBV DNA levels of the 3 groups were similar. Before delivery and 12 weeks after delivery, the HBV DNA levels of groups A and B were similar, but both were significantly lower than that of group C (P < 0.01, all). No infants in groups A and B were HBsAg-positive, but the infection rate of group C was 18.4% (P < 0.01). The HBV infection rate of infants was positively associated with the HBV DNA levels of the pregnant mothers. Conclusion: Administration of telbivudine to HBV-infected mothers, started during early and middle pregnancy, completely blocked mother-to-infant HBV transmission.