<prompt> Needle aspiration from gas gangrene showed gram positive organism with subterminal spores which is the likely organism involved?Cl.perfringensCl.septicumCl.novyiCl.difficile  <response>: Ans : a Cl.perfringensGas gangrene: Incubation period-3 days Most common organism: Cl.perfringens ! Cl.novyi! CLsepticum! Cl.histolyticum . Gas gangrene - malignant oedema clostridial myonecrosis Negler reaction: Cl.perfringens Citron bodies: cl.septicum Death in gas gangrene: due to circulatory failure Most important toxin biologically responsible for profound toxaemia of gas gangrene: a toxin Lecithi- nase C 