FIG 2 .

DensiTree of posterior distribution of trees from Bayesian phylogenetic analysis of 60 V. cholerae O1 isolates. A posterior distribution of trees was obtained from Bayesian phylogenetic analysis of genome-wide SNPs from 60 toxigenic V. cholerae O1 isolates using the GMRF skygrid model and strict molecular clock as implemented in BEAST 1.8.0. Tip dates for each node were assigned based on date of isolate collection, allowing the phylogeny to be scaled in time. DensiTree provides a visualization of the posterior distribution of trees by illustrating the frequency of node clustering to assess the support for clades and overall topology. Well-supported branches are indicated by solid colors, whereas webs represent little agreement. This is an alternative to presenting one “best” MCC tree.