Is Corynebacterium Diphtheriae Normally Toxigenic

question 37

Multiple Choice

Is Corynebacterium diphtheriae normally toxigenic?

• A) Yes, it always produces a cytotoxin that kills cells in the pharynx.
• B) Yes, it always produces a cytotoxin that kills ciliated epithelial cells of the trachea.
• C) No, it produces a cytotoxin only when it is infected by a lysogenic bacteriophage that expresses a toxin-producing gene.
• D) No, it produces a cytotoxin only when a toxin-encoding plasmid is transmitted via conjugation from another bacterium.

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