Once you purchase the food though, it's up to you to take care of it. This is important, especially for these deli foods, because a large number of foodborne illnesses are caused by improper handling of foods in the home. However, not all microorganisms cause food poisoning. Some bacteria, yeasts and molds are used in food production. Others are food spoilage microorganisms which cause foods to turn bad.
Bacteria are part of our environment.
Where there is food there may be bacteria. Proper food handling and cooking are the best ways to prevent foodborne illness. Consuming raw or undercooked meats, poultry, seafood, shellfish, or eggs may increase your risk of foodborne illness, especially for children, the elderly, pregnant women and those who have chronic illnesses or compromised immune systems. Buy deli meats in quantities that can be used in three to five days. Properly wrap and freeze deli meats that can't be used in that time.