Michigan Food Safety Management Practice Test

True or False: Most pathogenic bacteria need water activity (Aw) to be equal to or above 0.89 to multiply.

1. True

2. False

3. This is specific to certain bacteria

4. Only for viruses

The correct answer is: False

Most pathogenic bacteria indeed require a water activity level of 0.90 or above to multiply effectively. The threshold of 0.89 or below typically indicates an environment that is less than ideal for the growth of these microorganisms. Pathogenic bacteria thrive in environments with higher moisture levels, as water activity directly influences their ability to grow and reproduce. While some bacteria may have different minimum water activity requirements, the general understanding is that the majority need a higher level than 0.89. This knowledge is crucial in food safety, as controlling water activity in foods can help prevent the growth of harmful pathogens, thereby reducing the risk of foodborne illness. Therefore, indicating that the statement is false reflects an understanding of the specific requirements most pathogenic bacteria have regarding water activity.