Fig. 1
From: Surveillance and characterization of avian-origin H3N2 canine influenza viruses in 2021 in China
The phylogenetic tree of the hemagglutinin (HA) segment of H3N2 CIVs. The tree was constructed in maximum likelihood under the GTR + gamma + I model. The 2021 isolates involved in this study are highlighted in red. Names of the viral sequences downloaded from databases were in black, which included 37 strains submitted by our laboratory. A, B, C, D, E, F, and G represent different antigen groups of H3N2 CIVs, respectively. Scale bar is in units of nucleotide substitutions per site