Relationships between emm and multilocus sequence types within a global collection of Streptococcus pyogenes

BMC Microbiology

Table 2 Summary of S. pyogenes sample (sub)sets analyzed in this study.

			Distribution according to emm pattern:
Sample (sub)set	Characteristic	Total	A-C	D	E	Undefined or other
Complete	Number of isolates	582	156	181	240	5
Complete	Number of STs represented	259	42	91	123	5
Complete	Number of emm types represented	156	29	62	61	4
Complete	Number of unique combinations of emm type and ST	280	47	104	124	5
Complete	Simpson's diversity index *	0.993	0.950	0.985	0.990	n.d.
Complete	Simpson's diversity index, 95% confidence intervals	0.992–0.995	0.938–0.963	0.979–0.991	0.987–0.992	n.d.
emm nt substitution	Number of isolates	520	137	155	220	8
emm nt substitution	Number of emm types represented	105	18	40	44	3
emm nt substitution	Number of emm alleles represented	188	54	57	71	6
emm HGT	Number of isolates	531	143	156	224	8
emm HGT	Number of emm types represented	105	18	40	44	3
emm HGT	Number of STs represented	219	34	75	108	2

* Based on unique combinations of emm type and ST. Abbreviations: n.d., not determined; HGT, horizontal gene transfer; nt, nucleotide; ST, sequence type

ISSN: 1471-2180