543. Methods for the growth and enumeration of anaerobic spore-formers from cheese, with observations on the effect of nisin

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Abstract
Severe losses are caused in some types of cheese by the growth of spore-forming anaerobes. The species most commonly involved isClostridium butyricumand its variants, but other clostridia such asCl. sporogenes (Bacillus putrificusof Dorner (1)) may also be concerned. Existing methods for the study of the properties of these organisms are inadequate, a fact on which Rosenberger(2) has commented. This work has been particularly concerned with devising a medium suitable for all clostridia, which is clear, simple to prepare, and which requires no special anaerobic precautions in its use.