Map of Simcoe Muskoka

Infectious Diseases

Invasive Group A Streptococcus

Group A Streptococcus (GAS) is a bacteria commonly found in the throat and on the skin of healthy people. It can cause strep throat, scarlet fever, skin infections and other non-life threatening conditions. In very rare cases, GAS can become invasive . The most severe and least common forms of invasive GAS are  necrotizing fasciitis (NF), also known as the "flesh eating disease", and  streptococcal toxic shock syndrome (STSS). For more information, see the health unit's fact sheet on iGAS.

Simcoe Muskoka

Ontario

Technical Notes

Simcoe Muskoka

The following graph shows the number of invasive GAS cases in Simcoe Muskoka between 2000 and 2016.  There have been between 10 and 37 cases of invasive GAS cases every year in Simcoe Muskoka since 2000. In 2016, 28 cases of invasive GAS were reported in Simcoe Muskoka.

2014iGAS_counts

Ontario

The following graph shows the  incidence rate of invasive GAS in Simcoe Muskoka and Ontario between 2000 and 2016. The incidence rate in Simcoe Muskoka is comparable to the Ontario rate at 5.0 cases per 100,000 population.  The increases in the Simcoe Muskoka rate in 2007, 2011 and 2014 have been investigated with no evidence of clusters or links between cases.

There is some variability in the Simcoe Muskoka rate, which means that there are peaks and valleys and it is difficult to determine whether an increase is significant or whether it is within the expected range for this disease in these population.

2014iGAS_rates

More detailed data for Ontario and each health unit can be found on Public Health Ontario’s interactive Snapshots tool, by clicking on “Select Indicator”. 

Technical Notes

There are many factors that influence how many cases are reported to the health unit, as explained on the Infectious Diseases page.