Certified Cheese Professional Practice Exam

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What type of microorganism is Listeria monocytogenes?

Virus
Pathogen (Bacteria)
Fungus
Prion

The correct answer is: Pathogen (Bacteria)

Listeria monocytogenes is classified as a bacterium, meaning it falls under the category of pathogens, which are microorganisms capable of causing disease. This specific bacterium is known for its ability to cause listeriosis, an infection that can lead to serious complications, especially in vulnerable populations such as pregnant women, newborns, the elderly, and individuals with weakened immune systems. Understanding Listeria monocytogenes as a bacterium provides insight into its characteristics, such as being able to grow at refrigeration temperatures, which poses risks in food safety and handling. Unlike viruses, which require a living host to replicate, or fungi and prions, which are entirely different types of pathogens, Listeria monocytogenes can multiply in various environments, including within food products. This ability to survive and grow in challenging conditions is part of what makes it a significant concern in the food industry.