Fig. 4

Bayesian phylogeographic tree of West Nile lineage 2 complete genome sequences. Main clades described by alphabets: clade A–F. Groups of sequences belonging to the same region were collapsed and colored. Strains from Africa were shown by red circles whereas strains from Europe were shown by green circles. Branch support was shown for posterior probability greater than 0.7. Years (95% HPD) are reported in the main nodes