This chart shows those groups most at risk for Listeria food poisoning: Pregnant women and their newborns; older adults, and people with weakened immune systems. It also shows that when it comes to Listeria, some foods are more risky than others. Some foods where Listeria is known to hide include raw sprouts, raw milk (unpasteurized), deli meats and hot dogs (cold, uncooked), soft cheeses and smoked seafood.