<prompt> Gas gangrene is caused by all exceptCl. HistolyticumCl. novyiCl. septicumCl. Sporogenes  <response>: Gas gangrene is rapidly spreading, edematous myonecrosis occurring characteristically in association with a severe wound of extensive muscle mass contaminated by pathogenic clostridia. Most frequently encountered is clostridium perfringes. Also caused by clostridium novyi, Clostridium septicum and clostridium histolyticum. Reference: Textbook of Microbiology; Anathanarayan and panikers; 10th edition; Page no: 261 