Invasive group A streptococcal infections, clinical manifestations and their predictors, Montreal, 1995-2001.

Our findings agree with those of a study in Ontario, which identified an increasing trend for pneumonia attributable to GAS from 1992 to 1999 ( 33 ).

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Our findings would thus appear to concur with those of a another (case-control) study that found while M1 and M3 may be significant risk factors for IGASI, once a person is infected, environmental and host factors might have a role in determining the type of invasive disease manifestations ( 8 , 9 ).

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