Number of bacteria present in milk

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1. How does refrigeration affect the number of bacteria present in milk?

2. How does pasteurization affect the number of bacteria present in milk?

3. What differences, if any, would this assay show if performed using raw (unpasteurized) milk?

4. What differences, if any, would this assay show if performed using milk that was past its expiration date and had an off-putting odor?

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