Figure 2. Global virus transitions and movement between regions. 2a) Discrete phylogeographic transitions between regional states. Transitions represent virus movement between regional states, measured by Bayes factor support (S.A.: South America, N.A.: North America). Cells with Bayes factor values above 3.0 are framed by a green border (Kass & Raftery, 1995). 2b) Markov jumps, which are represented as the percent of global transitions between regional states along phylogenetic tree branches. Global transitions <1% are not shown.