Which statement about Lm being a pathogen of concern in food production environments is true?

Which statement about Lm being a pathogen of concern in food production environments is true?

• A. It frequently causes listeriosis among plant employees
• B. It cannot be destroyed by cooking or other lethality treatments
• C. It can form biofilms on food contact surfaces if not frequently cleaned
• D. It thrives in hot, dry conditions

Answer: (C)

Listeria’s ability to form biofilms on surfaces is what makes it a pathogen of concern in food production. Biofilms are communities of bacteria encased in a protective matrix that cling to food-contact surfaces like stainless steel and plastic. When cleaning is not performed frequently or thoroughly, these biofilms can establish themselves and persist through sanitation cycles, acting as a reservoir for contamination that can transfer to product streams. This persistence is a major reason why Listeria is watched closely in processing environments: even if planktonic (free-floating) cells are killed, the biofilm community can survive and eventually seed new contamination. Understanding this helps explain why the other statements aren’t accurate. Listeria infection comes from consuming contaminated food, not from frequent illness specifically among plant workers, so occupational risk is not the defining concern here. Cooking and proper lethality treatments can destroy Listeria when applied correctly, so it isn’t true that it cannot be destroyed by cooking. And Listeria actually thrives in cool, moist conditions, not hot, dry ones, so hot, dry environments are not favorable for its growth.

Listeria’s ability to form biofilms on surfaces is what makes it a pathogen of concern in food production. Biofilms are communities of bacteria encased in a protective matrix that cling to food-contact surfaces like stainless steel and plastic. When cleaning is not performed frequently or thoroughly, these biofilms can establish themselves and persist through sanitation cycles, acting as a reservoir for contamination that can transfer to product streams. This persistence is a major reason why Listeria is watched closely in processing environments: even if planktonic (free-floating) cells are killed, the biofilm community can survive and eventually seed new contamination.

Understanding this helps explain why the other statements aren’t accurate. Listeria infection comes from consuming contaminated food, not from frequent illness specifically among plant workers, so occupational risk is not the defining concern here. Cooking and proper lethality treatments can destroy Listeria when applied correctly, so it isn’t true that it cannot be destroyed by cooking. And Listeria actually thrives in cool, moist conditions, not hot, dry ones, so hot, dry environments are not favorable for its growth.