Fig. 1

Midpoint rooted phylogenetic tree showing genotypes and bootstrap values above 70 in different colors. The scale bar represents the rate of nucleotide substitutions per site. A maximum likelihood phylogenetic tree was generated from the sample full F gene alignment with all the retrieved NDV strains in this study. The sample ▲PV339969 of this study clustered closely with genotype XIV sequences (pink) but shows divergence from the commonly used NDV vaccine strains (blue).