The aim of this book is to bring together the information available on established clostridial diseases of the gastrointestinal tract, including the more recent observations with respect to the mechanisms of action and to critically review the data available which implicate clostridia in the gastrointestinal diseases of unknown etiology such as infantile necrotizing enterocolitis and large bowl cancer. Information on the wide range of gut diseases in animals, both natural and laboratory induced, in which clostridia have been shown to be involved or are being implicated, has been included, as in many instances these observations sever to help delineate the etiologies of human disease.