IIn this study, pregnant women with HBeAg-positive viral hepatitis b or high viral load will receive Tenofovir disoproxil fumarate from the 28th week of amenorrhoea until 6 weeks after delivery. Their newborns will receive the hepatitis B vaccine, starting with one dose at birth and followed by three booster doses, according to the Expanded Programme on Immunisation. The investigators hypothesise that a short course of TDF could greatly reduce the risk of HBV MTCT in pregnant women at high risk of MTCT (HBeAg positive or with high viral load).
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Proportion of children with HBsAg positive at 9-12 months of life (W36 - W48) in the study population,
Timeframe: measured between 36 and 48 weeks of life of the child of the mothers included in the study