Which pathogen is NOT among the Big Six?

Which pathogen is NOT among the Big Six?

• A. Salmonella Typhi
• B. Shigella
• C. Norovirus
• D. Listeria monocytogenes

Answer: (D)

The concept being tested is which pathogens are prioritized as the main threats in many food-safety training programs—the big six—the ones most commonly linked to outbreaks and requiring the strongest preventive controls. In this particular material, Listeria monocytogenes is not included in that prioritized group, even though it is a serious pathogen. The reason is that, while Listeria can cause severe illness and is a major hazard, the big six in this course are defined by the pathogens that most frequently drive outbreaks in typical settings, and those six do not list Listeria. The other pathogens named—Salmonella (including relevant non-typhoidal strains), Shigella, and Norovirus—are part of that top-priority group in this context, which is why the correct pick is Listeria monocytogenes as the one not among the big six here.

The concept being tested is which pathogens are prioritized as the main threats in many food-safety training programs—the big six—the ones most commonly linked to outbreaks and requiring the strongest preventive controls. In this particular material, Listeria monocytogenes is not included in that prioritized group, even though it is a serious pathogen. The reason is that, while Listeria can cause severe illness and is a major hazard, the big six in this course are defined by the pathogens that most frequently drive outbreaks in typical settings, and those six do not list Listeria. The other pathogens named—Salmonella (including relevant non-typhoidal strains), Shigella, and Norovirus—are part of that top-priority group in this context, which is why the correct pick is Listeria monocytogenes as the one not among the big six here.