Diphtheria is caused by

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(A) Diphtheria is caused by the toxin released by the bacterium $Corynebacterium$ $diphtheriae$. Specifically,the bacterial cells themselves do not in

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Poisons released by living bacterial cells into the host tissues

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(A) Diphtheria is caused by the toxin released by the bacterium $Corynebacterium$ $diphtheriae$. Specifically,the bacterial cells themselves do not inherently contain the gene for toxin production. Instead,a bacteriophage (a virus that infects bacteria) carries the gene for the toxin. Only those $C.$ $diphtheriae$ cells that are lysogenized by the $\beta$-phage are capable of producing the toxin,which then leads to the symptoms of diphtheria.

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