Chicken, tuna, egg, pasta, and potato salads have all been involved in foodborne-illness outbreaks. These salads are not usually cooked after preparation. This means you do not have a chance to reduce pathogens, such as Staphylococcus aureus, that may have gotten into the salad. Leftover TCS food such as pasta, chicken, and potatoes can be used only if it has been cooked, held, and cooled correctly.