<prompt> Clostridial organism areGram-positive aerobesGram-positive anaerobesGram-positive aerobesGram-negative anaerobes  <response>: The genus Clostridium consists of Gram-positive, anaerobic and spore forming bacilli.Eg: C.tetani, C.perfringens, C.difficile,C.botulinum etc. These are responsible for tetanus, gas gangrene and food poisoning. Reference : page 251 Ananthanarayan and Panickers Textbook of Microbiology 9th edition. 