Diphtheria is caused by

  • A
    Poisons released by living bacterial cells into the host tissues
  • B
    Poisons released from dead bacterial cells into the host tissues
  • C
    Poisons released by virus into host tissues
  • D
    Excessive immune response by the host's body

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What is the causative agent of plague?

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In which disease is a protein-rich fluid secreted that acts as a culture medium for bacteria?

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