Phylogenetic Analysis of Hemagglutinin Genes of H9N2 Avian Influenza Viruses Isolated from Chickens in Shandong, China, between 1998 and 2013

<div>Phylogenetic tree of HA genes of H9N2 AIVs used in this study. The black squares indicate the representative strains of distinct H9 lineages. The black triangles indicate vaccine strains.</div>

BioMed Research International

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Figure 1

Figure 1: Phylogenetic Analysis of Hemagglutinin Genes of H9N2 Avian Influenza Viruses Isolated from Chickens in Shandong, China, between 1998 and 2013 

Figure 1 | Phylogenetic Analysis of Hemagglutinin Genes of H9N2 Avian Influenza Viruses Isolated from Chickens in Shandong, China, between 1998 and 2013 