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  1. Diptheria is caused by
    1. poisons released from dead bacterial cells into the host tissue
    2. poisons released by living bacterial cells into the host tissue
    3. excessive immune response by the host's body
    4. poisons released by virus into the host tissues
Correct Option: A

Diptheria is a highly infectious disease caused by Cornybacterium diptheriae which liberates soluble toxin. The toxin affects nerves and cause double vision, difficulty in swallowing and paralysis of breathing muscles and limbs.


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