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Clostridia are regular Gram - positive endosporing rods. They are obligate anaerobes. Their metabolism is chemoheterotrophic, and they can often be found in soils. Pathogenic strains include C. botulinum (botulism), C. tetani (tetanus) , C. difficile (antibiotic-induced colitis) and C. perfringens (gas gangrene).
Bergey's Manual Volume 3: The low G+C Gram-positive Bacteria