Ensuring food is stored correctly is important. Fridges slow down the growth of most common bacteria and freezers stop them growing altogether, but neither kills them. Correct storage of food can also prevent bacteria spreading from one food to another, particularly raw foods.
For safe food storage:
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Follow storage instructions and 'use by' or 'best before' dates. If the food isn't eaten or frozen (if suitable) by the 'use by' date, throw it away.
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Keep the fridge and freezer clean and at the correct temperature. Use a fridge thermometer to check - the coldest part of the fridge should be below 5oC and the freezer should be kept at minus 18oC.