Fig. 4
From: On the onset and dispersal of a major MDR TB clone among HIV-negative patients, Tunisia
Dispersal of MDR and XDR epidemic strains. a Results of PASTML. The colour code for origin is the same as in Fig. 3. The size of the circles is proportional to the number of tips, and the size of the arrows is proportional to the number of times the pattern of migration was observed on the tree. The branches represent the inferred ancestral region with the largest posterior probability. b Map of Tunisia, the arrow shows the migration of XDR strain from the epidemic region to a Midwest City