Figure 1

Differences in the number of housekeeping alleles between isolates sharing an emm type. The y-axis shows the numbers of emm types represented by are each category, as defined by the x-axis. (A), The minimum number of differences in housekeeping alleles between isolates sharing an emm type are: zero (singleton STs), one or two (1 CC with multiple STs), three or four (multiple CCs with STs of intermediate distance), and five (multiple CCs whereby all STs are distant; represents HGT). (B), Distribution of the maximum number of differences in housekeeping alleles between isolates sharing an emm type. Clonal complex (CC) is defined by STs sharing at least 5 of 7 housekeeping alleles