Prevalence and Incidence of Invasive group A Streptococcal disease


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About prevalence and incidence statistics: The term 'prevalence' of Invasive group A Streptococcal disease usually refers to the estimated population of people who are managing Invasive group A Streptococcal disease at any given time. The term 'incidence' of Invasive group A Streptococcal disease refers to the annual diagnosis rate, or the number of new cases of Invasive group A Streptococcal disease diagnosed each year. Hence, these two statistics types can differ: a short-lived disease like flu can have high annual incidence but low prevalence, but a life-long disease like diabetes has a low annual incidence but high prevalence. For more information see about prevalence and incidence statistics.

Incidence (annual) of Invasive group A Streptococcal disease: 2,382 annual cases notified in USA 1999 (MMWR 1999); 1.95 per 100,000 in Canada 20001
Incidence Rate: approx 1 in 114,189 or 0.00% or 2,382 people in USA [about data]
Prevalance of Invasive group A Streptococcal disease: About 9,400 cases of invasive GAS disease occurred in the United States in 1999. Of these, about 300 were STSS and 600 were necrotizing fasciitis. In contrast, there are several million cases of strep throat and impetigo each year. 2 ... Approximately 8,800 annual cases of invasive disease (3.2/100,000 population) occurred in 2000; approximately 4% were STSS and 6% were NF.3

Footnotes:
1. Notifiable Diseases Online, PPHB, Canada, 2000
2. excerpt from Group A Streptococcal (GAS) Disease General: DBMD
3. excerpt from Group A Streptococcal (GAS) Disease: DBMD

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