Certified Cheese Professional Practice Exam

In which environments can Listeria monocytogenes be found?

1. Only in dairy products

2. Soil and water

3. Only in processed foods

4. Only in meat products

The correct answer is: Soil and water

Listeria monocytogenes is a bacterium known for its ability to thrive in various environments, which is why the selection indicating that it can be found in soil and water is accurate. This organism is particularly versatile and can survive in a range of temperatures, pH levels, and salinity, making it resilient in both natural and man-made environments. Listeria is not limited solely to a specific type of food product, such as dairy, processed foods, or meat products, although it can indeed be found in those items when they are contaminated. Its presence in soil and water reflects its natural habitat, from which it can enter food production systems and potentially lead to foodborne illness. By understanding that Listeria can be found in these broader environments, food safety professionals can better implement monitoring and preventative measures throughout the food supply chain.