A physician notices that several patients are infected with Clostridium difficile,but only a few of the patients are symptomatic for disease.The reason for this discrepancy is:

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The exotoxin gene is commonly encoded for by phages,plasmids,or transposons and does not normally reside within an organism's main DNA molecule.Exotoxins are highly characterized molecules that are composed of a nontoxic subunit that binds the toxin to the host cells,allowing attachment of the toxin.Exotoxins exhibit their effects without the aid of extracellular enzymes.Extracellular enzymes are another factor that contributes to the virulence and invasiveness of organisms.

A Physician Notices That Several Patients Are Infected with Clostridium