Advanced technical and regulatory guide | 2026 Edition
As of July 1, 2026, Regulation (EU) 2024/2895 will come into force, marking a significant shift in the approach to managing the risk associated with Listeria monocytogenes in ready-to-eat (RTE) products.
This new regulatory framework introduces a key principle: it is no longer sufficient to verify the presence of the microorganism in the final product; it is now necessary to scientifically demonstrate that the product does not support its growth throughout its entire shelf life.
In this context, parameters such as water activity (aW) and pH take on a central role and become essential tools for building solid and defensible evidence.
Listeria risk in ready-to-eat products
The presence of Listeria monocytogenes in Ready-to-Eat products represents one of the most critical microbiological risks in the food sector. The main reason is that these products are intended to be consumed without further heat treatment prior to ingestion. This means that any contamination is not eliminated before consumption.
Health impact: Listeriosis
Infection caused by Listeria monocytogenes, known as listeriosis, can manifest in two main forms.
The gastrointestinal form, generally milder, presents symptoms such as fever, diarrhea, nausea, muscle aches, and flu-like or common food poisoning symptoms.
The invasive form, on the other hand, is the most dangerous and occurs when the bacterium enters the bloodstream or the central nervous system. In these cases, severe conditions such as sepsis, meningitis, or encephalitis may develop, accompanied by symptoms such as confusion, neck stiffness, loss of balance, and, in the most severe cases, permanent neurological complications.
Vulnerable groups
The risk associated with listeriosis increases significantly in certain population groups. Pregnant women are among the most exposed, with possible consequences including miscarriage, premature birth, severe neonatal infections, or fetal death.
Newborns, the elderly, and immunocompromised individuals are also particularly vulnerable, with a much higher risk of developing invasive forms and severe complications.
Why the risk is high in RTE products
Ready-to-eat products have characteristics that amplify the risk:
- they do not undergo heat treatment before consumption
- they may be contaminated after the production process
- Listeria monocytogenes can grow even at low temperatures, including refrigeration
This means that the bacterium can not only survive but also increase during shelf life, even after packaging.
Industrial impact of Listeria risk
Beyond health implications, the presence of Listeria monocytogenes in RTE products has an extremely significant impact from an industrial perspective.
A single incident can lead to large-scale product recalls, production shutdowns, significant reputational damage, loss of certifications, and penalties from regulatory authorities. This is compounded by potential legal disputes and both direct and indirect economic losses.
In this scenario, preventive risk management is not only a regulatory obligation but also a strategic lever for business continuity.
Regulatory definition of RTE
According to Regulation (EC) 2073/2005, Ready-to-Eat foods are all products intended for direct consumption without the need for heat treatment prior to ingestion.
This definition includes a wide range of food categories, many of which present conditions favorable to the growth of Listeria monocytogenes.
Main categories of at-risk products
Dairy products
The dairy sector is among the most critical. Products such as fresh cheeses (mozzarella, ricotta, stracchino), soft or short-aged cheeses, raw milk cheeses, and dairy desserts like tiramisu and creams often have high water activity and a pH favorable to microbial growth.
RTE meat and processed meats
Sliced meats, hot dogs, roasted meats, and ready-to-eat cooked meats represent another high-risk category. In particular, vacuum-packed or modified atmosphere products may be subject to post-process contamination and allow microbial growth during refrigerated storage.
Fish and seafood products
Products such as smoked salmon, marinated fish, and other ready-to-eat seafood preparations are historically among the most involved in Listeria monocytogenes contamination cases due to conditions favorable to pathogen survival.
Refrigerated ready meals
Fresh-cut salads, refrigerated ready meals, packaged deli foods, and products such as sandwiches often combine long shelf life with direct consumption, increasing microbiological risk.
Stuffed bakery products and ready foods
Filled sandwiches, focaccia, stuffed pizzas, and products with cream or moist fillings represent another critical category, especially due to the presence of high-moisture components.
Desserts and ready sweets
Fresh desserts, cream-based products, cheesecakes, and semifreddo provide ideal conditions for microbial growth, particularly during prolonged refrigeration.
Other products
Fresh sauces, dressings, hummus, guacamole, fresh plant-based products, and vegan ready meals represent emerging categories where the risk is often underestimated but real.
The new regulatory framework
Regulation (EU) 2024/2895 is directly applicable in all Member States and introduces the obligation for operators to demonstrate that RTE products do not support the growth of Listeria monocytogenes throughout their entire shelf life.
In the absence of such demonstration, the most stringent criterion automatically applies: absence in 25 g for the entire shelf life.
Practical interpretation of the regulation
From an operational standpoint, this means that companies must shift from a control-based approach to a science-based demonstration approach.
It is necessary to understand product behaviour over time, generate solid data, and be able to defend it during audits.
The role of Water Activity (aW)
Water activity is one of the most relevant parameters for microbial growth. Listeria monocytogenes generally grows at aW values above 0.92–0.93.
Reducing aW therefore directly limits the pathogen’s ability to grow and provides concrete scientific evidence.
aWLife by Steroglass: the strategic tool for measuring water activity
In this scenario, aWLife by Steroglass becomes a strategic tool for companies.
It enables the collection of precise, repeatable, and traceable data—essential for demonstrating non-growth and confidently facing audits and inspections.
It is not just an analytical tool, but also a commercial and competitive lever for distributors and sales teams.
In a market where “no evidence = risk,” aWLife becomes a strong and tangible sales argument.
From regulatory compliance to competitive advantage
Listeria risk in Ready-to-Eat products is not only a health issue but also a critical factor for industrial sustainability.
The new regulation imposes a paradigm shift and makes a science-based approach essential.
Water activity is one of the most effective tools to address this challenge, and solutions like aWLife now represent a key element in ensuring compliance, safety, and competitiveness.
The time to adapt is now.
Companies that integrate tools like aWLife into their processes will not only comply with regulations but will turn an obligation into a concrete competitive advantage.