Diphtheria is caused by:

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(A) Diphtheria is a serious bacterial infection caused by the bacterium $Corynebacterium$ $	ext{diphtheriae}$.It is primarily caused by the secretion

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Secretion of toxins by living bacteria in the host tissue

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(A) Diphtheria is a serious bacterial infection caused by the bacterium $Corynebacterium$ $	ext{diphtheriae}$.It is primarily caused by the secretion of a potent exotoxin by the living bacteria that colonize the host's throat and upper respiratory tract.This toxin inhibits protein synthesis in the host cells, leading to cell death and the formation of a characteristic greyish pseudomembrane in the throat.

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