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Invasive Group A Streptococcal disease

Incidence Rates
 In 2016 there were 29 cases of iGAS in the NWHU region, giving a crude rate of 35.9 per 100,000, which was consistent with the 5-year average rate of 31.7 per 100,000.  Rates in the NWHU were increasing in recent years, tripling between 2007 and 2014, but appeared to have leveled off in 2015, with a slightly lower rate than the previous year.
iGas incident rates

Age and Sex Distribution

In the 5 years between 2012 and 2016, rates of iGAS were highest in males aged 60 and older, at 63.0 per 100,000 per year.  This was more than twice as high as rates in women aged 60 and older (25.0 per 100,000 per year).  Overall, the age group with the lowest incidence rate was those under 20, at 14.6 per 100,000 per year.  This was statistically lower than in all of the other age groups.

iGas by age group
Source: Public Health Ontario. Query: Northwestern Health Unit: Counts by age and sex. Toronto, ON: Ontario Agency for Health Protection and Promotion.  Extracted May 5, 2017

Monthly Incidence
Incidence of iGAS didn’t follow any particular monthly pattern over the past 5 years, with cases occurring at all times of the year.  The most cases from 2012-2016 occurred in November (20) and the fewest occurred in April (6).
iGas monthly stats
Source: Public Health Ontario. Query: Northwestern Health Unit: Historical comparisons by month and year. Toronto, ON: Ontario Agency for Health Protection and Promotion.  Extracted January 20, 2016


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