One-Health Challenge in H9N2 Avian Influenza: Novel Human-Avian Reassortment Virus in Guangdong Province, China

Figure 3

Phylogenetic tree of the NA genes of H9N2-subtype AIVs. Evolutionary trees with Bootstrap values >70% were generated by 1,000 bootstrap replicates using Bayesian inference. Viruses are labeled with different colors depending on the host (red: chicken, orange: environment, blue–green: duck, dark blue: pigeon, dark green: human, purple: wild bird, brown: goose, yellow: mink, light purple: cat). The red circles and font show the six H9N2 AIV strains isolated in this study, and the green font shows human influenza (H9N2). The pink background indicates the Eurasian branch and the blue background indicates the North American branch.