Numerical analysis of HI titers (see Table 4) by using hierarchical agglomerative clustering (A) and nonmetric multidimensional ordination in two dimensions (B). Colors indicate viruses from the FJ-like (red), GY1 (blue), GY2 (green), YN2 (purple), and GD/06 (orange) sublineages. MYS, Malaysia; Ph, pheasant; VTM, Vietnam/Thailand/Malaysia.