Fig. 1.

Phylogenetic tree for the HA gene constructed by the neighbour-joining method, which includes eight representative KSA viruses. The evolutionary distances were computed using the maximum composite likelihood method and are in the units of the number of base substitutions per site. Sequences obtained in this study were labelled with a filled circle. The numbers at each branch point represent bootstrap values and were determined by bootstrap analysis using 1000 replications. Bar, 0.005 nucleotide substitutions/site; *, sequence available in the EpiFlu database at the Global Initiative on Sharing Avian Influenza Data (GISAID; http://platform.gisaid.org/).