Which of following Clostridia is non-invasive -

Ans. is 'b > d' i.e., Clostridium botulinum > Clostridium tetani o Their invasive power is different in different species :Cl. botulinumo Virtually noninvasive and noninfectious.o Botulism is due to ingestion of preformed toxin.Cl. tetanio Has little invasive power and is confined to the primary site of lodgemento Tetanus results from the action of the potent exotoxinGas gangrene clostridiao Invasive and can spread along tissue.o Gas gangrene (clostridial myonecrosis) is caused by Cl perfringens/welchii, Cl septicum, Cl novyi and Cl histolyticum.