FSIS declared Listeria monocytogenes an adulterant in ready-to-eat products in which year?

• A. 1988
• B. 1990
• C. 1978
• D. 1998

Answer: (D)

Listeria monocytogenes in ready-to-eat foods is treated as an adulterant because this pathogen can grow at refrigeration temperatures and cause serious illness even in small amounts, especially in pregnant people, newborns, older adults, and those with weakened immune systems. Because these foods are consumed without further cooking, any detectable presence of Listeria in ready-to-eat products creates a high risk that enforcement actions will be taken to remove contaminated products from the market.

In 1998, FSIS formalized this risk by declaring Listeria monocytogenes an adulterant in ready-to-eat products. That designation means that the mere presence of the organism in these foods constitutes adulteration, enabling stronger inspection, recall, and compliance actions to protect public health. This milestone reflected the agency’s move toward stricter control of pathogens in foods that are eaten without cooking and helped drive subsequent implementation of more rigorous preventive measures and testing programs in industry.