Fig. 1.

Evolutionary analysis of BtHV and representatives of other orthohepadnaviruses based on their complete Pol nucleotide sequences, with avian hepatitis viruses used as an outgroup. The phylogenetic tree was constructed by the maximum-likelihood method using MEGA 5.1. Viruses identified in this study are indicted by filled triangles; previous BtHVs, with open triangles. The hosts of RBHBV and HBHBV in Gabon, TBHBV in Panama, BtHV in Myanmar and BtHV in China are Rhinolophus alcyone, Hipposideros cf. ruber, Uroderma bilobatum, Miniopterus fuliginosus and Hipposideros pomona. The scale bar indicates nucleotide substitutions per site