There is no easy way to test for pathogens such as

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BlackTom AI · Accepted Answer

In this question, we’re evaluating which pathogen is notably difficult to test for with routine methods. 
Option 1: Listeria. Listeria monocytogenes can be cultured and detected using standard microbiological methods in many labs, including selective media and enrichment steps, so it is not typically described as ‘no easy way to test.’ This makes this choice inaccurate as the sole correct answer.
Option 2: Salmonella. Like Listeria, Salmonella species are commonly detected through established culture-based and molecular methods in routine food-safety workflows. Therefore, saying there is no easy way to test for Salmonella overstates the difficulty and is not the best choice given typical lab capabilities.
Option 3: Norovirus. Norovirus is famously problematic to test for with simple, routine laboratory techniques because it is a non-culturable virus in many settings and requires specialized molecular methods (such as RT-PCR) on appropriately prepared samples, often with stringent controls. Culturing the virus is not straightforward, and environmental and clinical testing can be challenging, which aligns with the statement that there is no easy way to test for this pathogen.
Option 4: Escherichia coli O157:H7. This strain of E. coli is a well-known target for standard detection methods, including culture on selective media and confirmatory tests. It is less difficult to test for compared with Norovirus, so this option does not fit the idea of having no easy test.
Across these options, the key distinction is that Norovirus presents unique testing challenges, whereas the bacterial pathogens listed can be detected with established, comparatively straightforward laboratory methods. The reasoning above clarifies why Norovirus is the most fitting choice given the typical constraints described.

2025SP-FSHN-150-001 Module 12 - Quiz - Protecting Our Food Supply

There is no easy way to test for pathogens such as

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