FIG. 2.

Cluster analysis of strains of defined tissue site of isolation. The dendrogram shows all unique emm type-ST combinations (n = 61) of isolates known to be recovered from either the URT or impetigo lesions. Labels at branch tips indicate emm type, followed by emm pattern group (A-C [ABC], D, or E); for cases where there is more than one ST associated with a given emm type, the string ends with a numerical assignment. In all instances, isolates of a given emm type share the same emm pattern grouping. Large asterisks denote nodes at linkage distances of ≤0.6, with descendants represented by six or more distinct clones (i.e., STs) and/or emm types. The number of URT (○) and impetigo (▴) isolates for each emm type-ST combination is indicated to the left of the branch tip labels.