Diphtheria is due to toxin released by
Virus
Living bacteria
Immune cells
Dead bacteria

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Solution

The correct option is B Living bacteria
Diphtheria toxin is an exotoxin secreted by the living bacteria Corynebacterium.

The toxin gene is encoded by a prophage called corynephage $β$ .

This toxin enters into the cell cytoplasm and inhibits protein synthesis.

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