Fig. 5

Maximum- likelihood phylogenetic trees for complete nucleotide sequences of (a) E6, (b) E1, and (c) 74 genes for a panel of EHV2 Australian isolates and representatives of previously reported EHV2 genogroups for each gene [75]. The genogroup designation from a previous study are shown by the numbers [75]. Phylogenetic analysis was inferred by using the Maximum likelihood method based on the General Time Reversible model (GTR) using 1000 bootstrap replicates. The percentage (> 80%) of trees in which the associated taxa clustered together is shown next to branches. The trees were initially built by applying BioNJ method to a matrix of pairwise distances estimated using Maximum Composite Likelihood (MCL) approach. The tree is drawn to scale, with branch lengths measured in the number of substitutions per site as indicated on the scale bar. Isolates in oval (red or black) indicate those recovered from the same horse