Figure 1.

Minimal age of major nodes within the Yersinia pestis genealogy. Dates (grey) are the most recent dates estimated for the nodes shown as grey circles. This genealogy contains three branches, branch 0, 1 and 2, as well as one leaf per genome sequenced. Branch 3 is not shown because no public genome is yet available but branches at the split between branches 1 and 2. Population assignments (1.ORI3, 0.ANT2, etc.) are indicated in colours, while the dates of the three plague pandemics are indicated within yellow-rounded rectangles. MRCA, most recent common ancestor. Adapted from Morelli et al. [7].