What is a common source of listeriosis, a foodborne illness?

Listeriosis is primarily associated with listeria monocytogenes, a bacteria that can thrive in cold environments and is often found in certain types of food. Unpasteurized dairy products are a well-documented source of this bacteria because the pasteurization process is designed to kill harmful bacteria, including listeria. Therefore, consuming unpasteurized milk, cheeses, or other dairy items increases the risk of listeriosis.

While other food sources like packaged cooked meats and unwashed fruits and vegetables can carry risks for different foodborne illnesses, they are not as strongly linked to listeriosis as unpasteurized dairy products. In contrast, frozen meals typically involve cooked foods that have been prepared under safe conditions, reducing the likelihood of listeria contamination. Hence, unpasteurized dairy products are the most common and significant source of listeriosis.