Diphtheria is caused by

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7.Human Health and Disease

normal

Diphtheria is caused by

Poisons released by living bacterial cells into the host tissues

Poisons released from dead bacterial cells into the host tissues

Poisons released by virus into host tissues

Excessive immune response by the host's body

Solution

Toxins released from Corynebacterium diphtheriae causes diphtheria. Actually, bacterial cells do not contain gene for toxin production-a phage carries the gene for it. Only those lysogenised cells of $\mathrm{C} .$ diphtheriae which carry $\beta-\dot{6}$ phage, can produce the toxin and cause diphtheria.

Standard 12

Biology