what is the causative agent of necrotizing fasciitis
by Erica Nagel. Necrotizing fasciitis, or the flesh eating bacteria, is a skin disease which can be caused by several bacteria, but the most common and deadly causative agent is Streptococcus pyogenes, or group A streptococcus, from here on denoted as GAS (Tortora 591).AS is the causative agent for several diseases and is among the most common human pathogens (Tortora 590). This bacterium also causes scarlet fever, impetigo, cellulitis, and sepsis. The only known natural reservoir of S. pyogenes is the skin and mucous membranes of humans (Luckman 1).