In raw non-intact beef products, E. coli O157:H7 and other STECs are considered adulterants because:

• A. They are not expected to be found within the muscle tissue of non-intact product
• B. They cause illness only when ingested with non-intact products
• C. They only exist within non-intact product
• D. They only proliferate in non-intact product

Answer: (A)

Pathogens like E. coli O157:H7 are treated as adulterants in raw non-intact beef because their presence inside the muscle tissue is not expected. The interior of healthy muscle is normally free of these bacteria; contamination on the surface of a whole cut becomes a problem only when the cut is ground or otherwise processed, allowing surface organisms to be mixed throughout the product. That is why finding STECs in raw non-intact beef is considered adulteration—it's not something that should be inside the muscle itself. Other statements aren’t accurate: illness can result from ingestion, not limited to non-intact products; these bacteria can be present on surfaces or in other contexts, and they aren’t restricted to proliferating only in non-intact products.