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Phylogeographic analysis of 44 isolates of serovar Napoli in Northern Italy. The branches of the maximum clade credibility (MCC) tree are color-coded on the basis of the most probable location of the descendent nodes: NW.Prealps (red); SE.PoV (green); MetMI (cyan); and NE.Prealps (purple). The scale at the bottom of the tree represents calendar years. The main geographical clades are highlighted (see also Table 1).
