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The minimum water activity for growth of Clostridium botulinum is approximately

  • A.0.99
  • B.0.93
  • C.0.85
  • D.0.75

Answer: B

FDA gives the minimum as approximately 0.93, noting that depending on product characteristics it can be as high as 0.96. That is a relatively demanding requirement, which is why reducing water activity is an effective control against this organism.

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