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All of the 8 strains that were previously assumed to be nontoxigenic Clostridium botulinum type C were re-examined for their toxigenicity and were demonstrated by trypsinization of the culture filtrates to produce C2 toxin under improved cultural conditions. One per cent glucose added to trypticase peptone medium enhanced C2 toxin production. The larger the spore population, the higher the C2 toxicity and when spore population was smaller than a level of 10(4)/ml, no C2 toxicity was demonstrated. The C2 toxin was produced only during sporulation and not during vegetative growth.
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