2. Incidence of necrotizing fasciitis.

Incidence of necrotizing fasciitis
Authors	Period of study	Country	Pathology	Incidence
Kaul R et al (Kaul 1997)	1991	Canada	GAS NF	0.085 per 100,000 p‐y
	1995			0.4 per 100,000 p‐y
Ellis Simonsen et al (Ellis Simonsen 2006)	January 1997 to December 2002	United States	NF	0.04 per 1000 p‐y
O'Grady et al (O'Grady 2007)	March 2002 to August 2004	Australia	IGAS	2.7 per 100,000 p‐y (10.9% of NF)
Lamagni et al (Lamagni 2008)	January 2003 to December 2004	Europe	IGAS	2.37 per 100,000 p‐y (8% of NF)
Lepoutre et al (Lepoutre 2011)	November 2006 to November 2007	France	IGAS	3.1 per 100,000 p‐y (18% of NF)

GAS NF:group A streptococcal necrotizing fasciitis; IGAS: invasive group A streptococcal disease; NF: necrotizing fasciitis; p‐y: person‐years