Botulism is a rare, life-threatening paralytic illness caused by neurotoxins produced by an anaerobic, gram-positive, spore-forming bacterium, Clostridium botulinum.[1] Unlike Clostridium perfringens, which requires the ingestion of large numbers of viable cells to cause symptoms, the symptoms of botulism are caused by the ingestion of highly toxic, soluble exotoxins produced by C. botulinum while growing in foods.[2] These rod-shaped bacteria grow best under anaerobic (or, low oxygen), low-salt, and low-acid conditions.[3] Bacterial growth is inhibited by refrigeration below 4° C., heating above 121° C, and high water-activity or acidity.[4] And although the toxin is destroyed by heating to 85° C. for at least five minutes, the spores formed by the bacteria are not inactivated unless the food is heated under high pressure to 121° C. for at least twenty minutes.[5] C. botulinum bacteria and spores are widely distributed in nature, because they are indigenous to soils and waters.[6] They occur in both cultivated and forest soils, bottom sediment of streams, lakes, and coastal waters, in the intestinal tracts of fish and mammals, and in the gills and viscera of crabs and other shellfish.[7]
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