Food Borne Illness. Meats, sauces, pastries, desserts, and unwashed fruits and vegetables may all be associated with food-bornes illnesses, most commonly "creamy" sauces or pastry fillings.
Agree w Dr. Knox. It can be in raw poultry & meat as well as raw eggs & seafood. Vegetables & fruit may be irrigated or washed w contaminated water. Cross contamination can also occur during food preparation. Ciguatera in tropical fish that have eaten toxic plankton, Shellfish fed on toxic algae, Scromboid in poorly refrigerated dark meat fish,Puffer fish. Some mushrooms such as Amanita phalloides.) Parasites too.