what causes necrotizing fasciitis
Necrotizing Fasciitis Causes. Necrotizing fasciitis is caused by bacteria in the vast majority of cases, though fungi can also rarely lead to this condition as well.Many cases of necrotizing fasciitis are caused by group A beta-hemolytic streptococci (Streptococcus pyogenes), either individually or along with other bacterial pathogens.Group A streptococcus is the same bacteria responsible for  strep throat , impetigo (skin infection), and rheumatic fever.n many cases of necrotizing fasciitis, there is a history of prior trauma, such as a cut, scrape, insect bite, burn, or needle puncture wound. These lesions may initially appear trivial or minor. Surgical incision sites and various surgical procedures may also serve as a source of infection.