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Types of exotoxin, most commonly associated with botulism in man, is/are?

  • A.Type A
  • B.Type B
  • C.Type E
  • D.All of these

Answer: D

Correct answer: All of these

Seven antigenic types of botulinum toxin are recognised, A to G, but only three cause most human disease: type A, associated with home-preserved vegetables and predominant in the western United States, type B, in Europe, and type E, associated with fish and marine sediments. Types C and D affect animals and F and G are rare. This is why the therapeutic antitoxin is trivalent, covering A, B and E.

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