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Foodborne illness (also foodborne disease and colloquially referred to as food poisoning) is any illness resulting from the food spoilage of contaminated food, pathogenic bacteria, viruses, or parasites that contaminate food, as well as chemical or natural toxins such as poisonous mushrooms.
In addition, poisonous chemicals, or other harmful substances can cause foodborne diseases if they are present in food. 1  More than 250 different foodborne diseases have been described. 2  Most of these diseases are infections, caused by a variety of bacteria, viruses, and parasites that can be foodborne. The toxins produced by bacteria vary in their sensitivity to heat. 2  The staphylococcal toxin which causes vomiting is not inactivated even if it is boiled. 3  Fortunately, the potent toxin that causes botulism is completely inactivated by boiling.