Absolute data for the incidence and prevalence of necrotizing fasciitis are lacking. Type I (due to mixed anaerobic-facultative anaerobic infections) is more common than type II (group A streptococci) necrotizing fasciitis.  Type II complicates about 5% of invasive group A streptococcal infections at an estimated rate of 2 cases per million population per year.  There is no trend toward an increase or decrease in the prevalence or incidence of necrotizing fasciitis, or evidence of global differences in epidemiology.
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