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. 2017 Dec 22;8:2611. doi: 10.3389/fmicb.2017.02611

Figure 1.

Figure 1

Bayesian phylogenetic tree of the hemagglutinin (HA) gene of avian influenza A H9N2. The branches are colored according to the location of their nodes. Histograms on the right side of the phylogenetic tree show the geographical distribution of each lineage. The sequences in HA lineage I were from Asia, Europe, Africa, and America, so we named HA lineage I as HA-World lineage. The sequences in HA lineage II were from Asia and Africa, so we named HA lineage II as HA-Asia-Africa lineage. The sequences in HA lineage III were only from Asia, and if we were more precise, we would find most sequences in lineage III were from Hong Kong and other provinces in China. So, we named HA lineage III as HA-China lineage.