The Clostridium reference article from the English Wikipedia on 24-Jul-2004
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Clostridium

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Clostridium
Scientific classification
Kingdom:Bacteria
Division:Firmicutes
Class:Clostridia
Order:Clostridiales
Family: Clostridiaceae
Genus: Clostridium
Species
  Clostridium acetobutylicum
  Clostridium aerotolerans
  Clostridium botulinum
  Clostridium colicanis
  Clostridium difficile
  Clostridium formicaceticum
  Clostridium novyi
  Clostridium perfringens
  Clostridium tetani
Clostridium is a genus of anaerobic spore-forming bacteria.

There are many species of Clostridium but the four main species that cause disease in humans are: