Table 2. Invasive indexes for emm types in group A Streptococcus isolates from patients with invasive disease and pharyngitis, Ontario, Canada, 2002–2010.

emm type	Invasive disease frequency	Pharyngitis frequency	Invasive index
1	0.298	0.142	2.09
2	0.021	0.094	0.22
3	0.051	0.037	1.38
4	0.057	0.150	0.38
5	0.028	0.025	1.12
6	0.029	0.060	0.48
11	0.031	0.017	1.82
12	0.081	0.138	0.59
22	0.005	0.007	0.71
28	0.051	0.098	0.52
49	0.036	0.002	16.7
75	0.022	0.034	0.65
77	0.024	0.058	0.41
78	0.006	0.002	3.0
89	0.058	0.058	1.0
Others	0.202	0.078	2.59