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What you should know:

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). 



Domain Bacteria

    Phylum Firmicutes

        Class Clostridia

Bergey's Manual Volume 3: The low G+C Gram-positive Bacteria