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Volume 17, Number 11—November 2011

Research

Group A Streptococcus emm Gene Types in Pharyngeal Isolates, Ontario, Canada, 2002–2010

Patrick R. Shea, Amy L. Ewbank, Javier H. Gonzalez-Lugo, Alexandro J. Martagon-Rosado, Juan C. Martinez-Gutierrez, Hina A. Rehman, Monica Serrano-Gonzalez, Nahuel Fittipaldi, Stephen B. Beres, Anthony R. Flores, Donald E. Low, Barbara M. Willey, and James M. MusserComments to Author 
Author affiliations: The Methodist Hospital Research Institute, Houston, Texas, USA (P.R. Shea, A.L. Ewbank, J.H. Gonzalez-Lugo, A.J. Martagon-Rosado, J.C. Martinez-Gutierrez, H.A. Rehman, M. Serrano-Gonzalez, N. Fittipaldi, S.B. Beres, A.R. Flores, J.M. Musser); Texas Children’s Hospital, Houston (A.R. Flores); Baylor College of Medicine, Houston (A.R. Flores); Mount Sinai Hospital/University Health Network, Toronto, Ontario, Canada (D.E. Low, B.M. Willey); Ontario Agency for Health Protection and Promotion, Toronto (D.E. Low); University of Toronto, Toronto (D.E. Low)

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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

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