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Invasive group A streptococcal (iGAS) disease was placed under surveillance in Alberta in August 1999. The purpose of this study was to determine the incidence rates of iGAS infections throughout Alberta over a 3-year period (2000 to 2002) and to better understand the epidemiology of iGAS in this province. There were a total of 441 cases of invasive GAS disease over the 3 years examined (average population over 3 years, 3,055,765) and 47 deaths. The incidence in Alberta was 5.0 (2000), 5.7 (2001), and 3.8 (2002) per 100,000. The two main metropolitan regions (Edmonton and Calgary) had the majority of iGAS disease cases (305 cases), producing incidence rates of 4.8 (Edmonton) and 6.9 (Calgary) in 2000, 6.9 (Edmonton) and 6.6 (Calgary) in 2001, and 4.1 (Edmonton) and 3.9 (Calgary) in 2002, as well as deaths attributable to GAS (31 deaths). The three most prevalent M types were M1 (71 cases), M3 (52 cases), and MPT2967 (44 cases). With respect to age, the highest incidence rates occurred in those less than 1 year old (11.7 per 100,000) and those 65 years or older (11.5 per 100,000). Varicella virus infection preceded iGAS disease in 25% of children 8 years of age and under. A seasonal association was observed during the 3 years studied, with the highest number of cases occurring in the winter months and the lowest occurring during the summer months. The data for years 2000 and 2001 show that the metropolitan regions of Alberta experienced some of the highest incidence rates reported in North America in the past decade.

Invasive Group A Streptococcal Disease in Alberta, Canada (2000 to 2002)