(A) Divergence among the sub-populations of the global Cng isolates. (B) Differentiation between sub-populations of the global Cng isolates.

The isolates are subdivided by continent: Africa (n = 44), Asia (n = 191), North and South America (n = 19 and 5, respectively).aminimum estimate of the number of nucleotide differences per site between groups;bnumber of fixed differences between groups;cnumber of shared polymorphisms between groups.dKST* values are displayed above the diagonal and represent the weighted measure of the ratio of the average pair-wise differences within groups to the total average pair-wise differences.eSnn values are displayed below the diagonal and in bold and represent the proportion of nearest neighbours in sequence space that are found in the same group.Significance levels for KST and Snn were assessed using permutation tests, with 1000 permutations:ns = non-significant, **PPEurope has been excluded as it contains only two isolates.