FIG. 5.

Clustering by eBURST analysis of the 318 ST of serotype 6A strains included in the MLST database, showing the major clonal complexes associated with this serotype based on a minimum similarity of four identical loci. The ST1390 clonal complex is unrelated to other serogroup 6 clonal complexes and shares three identical loci with strains of serogroups 15, 18, and 21. Clonal complexes shown in boxes are ST or predicted founder ST of the serotype 6A strains detected in the present study. Numbers in circles (N) indicate the number of serotype 6C isolates associated with each clonal complex.