Figure 4:

Bayesian phylogeographic reconstruction for the full data set incorporating travel history data. Although the analysis was performed using 44 location states, nodes and branches are shaded according to an aggregated color scheme for clarity (the reconstruction with a full color scheme can be found in the Supplementary information). Lineage classifications are highlighted for specific clusters: lineage A is embedded in lineage B. For lineage B, only specific sub-lineages are indicated. The taxa further investigated using trajectory plots are indicated at the tips of the trees. The inset represents a histogram of the node posterior support values. Viruses from Switzerland (SW) and Australia (AU) that are investigated as case studies are labeled.