Staphylococcus aureus (staph) is a type of bacteria that’s commonly found on the skin, throats and nostrils of many healthy people and animals. Therefore, it usually doesn’t cause illness unless it is transmitted to food products where it can multiply and produce harmful toxins. Staphylococcal food poisoning can cause many of the same symptoms as other foodborne illnesses, such as nausea, stomach cramps, vomiting or diarrhea. The bacteria can also be found in unpasteurized dairy products, salty foods such as ham and other sliced meats, or in foods that require no cooking, such as puddings, prepared salads or sandwiches. Staphylococcal toxins are heat resistant, which means they cannot be destroyed by cooking.