Maximum clade credibility tree for all the O CATHAY FMDV isolates sequenced ( n = 322). Nodes with a posterior probability value ≥ 0.7 are shown. Branches are coloured according to the most probable country of the node from which they descended as estimated from the discrete state phylogeographic Bayesian model. Geographical links between countries identified by the BSSVS analysis are coloured by the corresponding BF value. The year codes in virus isolate labels have been abbreviated to the last two digits. The geographical locations are defined with the country centroid.