Fig. 1

Molecular Phylogenetic analysis by Neighbour Joining method. The evolutionary history was inferred by using the Maxi Neighbour Joining method based on the Tamura-Nei model. Sequences derived from mothers samples are prefixed by M- and annotated with a black square while the single child-derived sequence is denoted as B1 and annotated with a red triangle. Sequences from the study were aligned against other HBV sequences deposited on GenBank