All of the following are characteristic of Corynebacterium diphtheriae EXCEPT:
A. Humans are the only known reservoir.
B. It produces a single "A-B"exotoxin that inhibits eukaryotic protein synthesis.
C. Gram-positive club-shaped rods with metachromatic granules.
D. Avirulent strains acquire their virulence factors from virulent strain through lysogenic phages.
E. Avirulent strains acquire their virulence factors from virulent strain through plasmids.
Answer: E. Avirulent strains acquire their virulence factors from virulent strain through plasmids.
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