S. and parts of ST. JOHN'S, Canada Mexic o , large areas 100' W j - l2o' a re suscep tible to - - -- 10' desertificat ion from 12' 0" =t=, .- Jan Apr Jul - 1 Oct
enterotoxins described earlier). These toxins also have a distinct pharmacology. Clostridium perfringens occupies an interest- Examples of exotoxins are staphylococcal ing position, since it is both a food-borne enterotoxins (affecting the intestinal tracts) infection agent as well as a food-borne intox- and botulinum neurotoxins (affecting the ication agent. On the one hand, the suscep- nervous system). tible person has to ingest large numbers of Endotoxins are part of the cell wall mate- viable C. perfringens before coming down rial of Gram-negative cells. Every Gram- with a food-poisoning case, and on the other negative bacterium examined has endotoxins. hand, the organism produces an enterotoxin These are complex molecules containing to cause the illness. In 2002 in the United protein, carbohydrate, and lipid
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