Discussion
Depending on product characteristics, the minimum water activity for Clostridium botulinum can rise as high as
Answer: C
Correct answer: 0.96
Clostridium botulinum is among the more demanding pathogens in its water requirement, and the minimum activity at which it will grow depends on the product and on the solute used to depress the activity, rising to around 0.96 in some. Lowering water activity below what the organism needs is therefore one of the standard hurdles against it, alongside a pH of 4.6 or below, refrigeration, and nitrite in cured meats.
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