ListeriaDrake Davis2/11/15 It can still spread in the cold temperature of a refrigerator and can only be killed by cooking I don't think I'll eat caramel apples anymore. Listeria is a bacteria found in soil and some animals. The symptoms of listeria are: fever, stiff neck,weakness,confusion, and diarrhea. These are showing some of the people at risk and which foods can possibly have listeria. You can easily prevent the probability of getting listeria by washing your hands and silverware and countertops and incubation is 3-70 days. This is the kind of cheese that can be used in the cheese dip at Ameca!