Which of the following foods is commonly contaminated with Listeria?

Unpasteurized cheeses are commonly associated with Listeria contamination due to the conditions under which they are produced and stored. Listeria monocytogenes, the bacteria responsible for listeriosis, can thrive in environments that are not adequately controlled for temperature and hygiene, making unpasteurized dairy products, including cheeses, particularly susceptible to contamination. This is especially true for soft cheeses, which retain moisture and can provide a friendly environment for bacterial growth.

On the other hand, cooked grains and baked goods, while they can potentially be contaminated if mishandled, are not typically seen as primary vehicles for Listeria. Fresh seafood is more often associated with other pathogens, although cross-contamination can occur if seafood is improperly handled or stored. The distinction lies in the specific risks associated with unpasteurized dairy products versus the other types of foods listed, reinforcing the need for proper food safety practices, particularly when handling unpasteurized cheeses.