How common is invasive group A streptococcal disease?
In Ontario, every year, approximately 2-3 people out of every 100,000 have an invasive GAS infection. Approximately 15% of these cases have had streptococcal toxic shock while the number of people with necrotizing fasciitis was 39 in 1998. This is much less than the thousands of people who experience non-invasive infections such as strep throat or impetigo each year.
