Figure 3: Minimum spanning tree of 31 French B. anthracis strains belonging to the A.Br.011/009 canSNP subgroup

Minimum spanning tree of 31 French B. anthracis strains belonging to the A.Br.011/009 canSNP subgroup (obtained with BioNumerics 6.6 from Applied Maths). Data are based on 560 chromosomal SNPs (A), 20 pXO1 SNPs (B) and 18 pXO2 SNPs (C). The six resolved branches are color-coded. The diameter of each circle varies according to the number of isolates having the same genotype. The length of each branch is proportional (logarithmic scale) to the number of SNPs identified between strains. Indicated in red are the positions and names for two canSNPs described in this study. NE: North-East, SW: South-West, SE: South-East. Based on a parsimony approach, the tree size is 561, i.e. it contains approximately 0.18% of homoplasia. Concerning the plasmids, the tree sizes are 20 and 18 for pXO1 and pXO2, respectively, i.e. it contains no homoplasia.