<prompt> The following statements are true regarding Clostridium perfringens exceptIt is the commonest cause of gas gangreneIt is normally present in human faecesThe principal toxin of Clostridium perfringens is the alpha toxinGas gangrene producing strains of Clostridium Perfringes produce heat resistant spores  <response>: Spores are usually destroyed within five minutes by boiling but those of the food poisoning strains of type A and ceain type C strains resist boiling for 1-3 hours. Autoclaving at 121 deg for 15 min is lethal. Spores are resistant to the antiseptics and disinfectants in common use. C.perfringens is the predominant agent causing gas gangrene. Reference: Textbook of Microbiology; Anathanarayan and panikers; 10th edition; Page no: 258 