Figure 1

Phylogenetic tree of class I NDV isolatess based on the older classification methods by the variable region (nt 47–420) of the F gene. The reference class I NDV isolates characterized in this study were shown in bold.
Phylogenetic tree of class I NDV isolatess based on the older classification methods by the variable region (nt 47–420) of the F gene. The reference class I NDV isolates characterized in this study were shown in bold.