Food Safety Hazards

Salmonella in Food: Sources, Symptoms & Kitchen Controls

How to Control Salmonella in Your Food Business

Salmonella is one of the leading causes of bacterial foodborne illness in the UK, with the Food Standards Agency estimating around 33,000 lab-confirmed cases annually and far more going unreported. The bacteria thrive in the intestinal tracts of poultry, livestock, and reptiles, and can survive on surfaces and in food for extended periods. For food businesses, controlling Salmonella means managing raw materials (particularly poultry and eggs), preventing cross-contamination, and ensuring thorough cooking. Getting this wrong does not just risk customer illness. It risks enforcement action, prosecution, and closure.

Key takeaways

Raw poultry is the single highest-risk ingredient for Salmonella in most food businesses.

Cook all poultry, minced meat, and egg dishes to at least 75C core, or 70C held for 2 minutes.

Never wash raw chicken - it spreads bacteria via splash contamination.

Use Lion Code eggs for dishes served with runny yolks, and document this in your HACCP plan.

Staff with diarrhoea or vomiting must be excluded for 48 hours after symptoms stop.

Where Salmonella Comes From

Salmonella species (most commonly S. Enteritidis and S. Typhimurium in the UK) are found naturally in the gut of chickens, turkeys, pigs, cattle, and wild birds. Raw poultry is the highest-risk ingredient in most kitchens. FSA surveys have consistently found Salmonella on a proportion of retail chicken, though UK vaccination programmes have significantly reduced prevalence compared to the early 2000s. Eggs are another major vehicle: Salmonella can be present inside the egg (transmitted from the hen before the shell forms) or on the shell surface from faecal contamination. Lion Code eggs (stamped with the red lion mark) come from vaccinated flocks and carry a much lower risk, but non-Lion eggs and imported eggs remain higher risk. Raw leafy salads, bean sprouts, herbs, and spices are increasingly recognised sources, often linked to contaminated irrigation water or processing environments overseas. Unpasteurised milk and raw meat are additional vehicles.

Symptoms and Why It Matters Commercially

Salmonella infection (salmonellosis) typically causes diarrhoea, abdominal cramps, fever, nausea, and vomiting within 6 to 72 hours of ingestion. Symptoms usually last 4 to 7 days, but can be severe in vulnerable groups including young children, the elderly, pregnant women, and immunocompromised individuals. In a commercial context, a confirmed Salmonella outbreak linked to your business triggers a mandatory investigation by Environmental Health and potentially the UK Health Security Agency (UKHSA). If multiple cases share the same strain and your premises is identified as the source, you face potential prosecution under the Food Safety Act 1990 and the Food Safety and Hygiene (England) Regulations 2013. Insurance claims, negative press coverage, and loss of customer trust follow. For care homes and hospitals, the consequences can include fatalities.

Kitchen Controls That Actually Work

Cooking is your primary kill step. Salmonella is destroyed at 70C held for 2 minutes, or the equivalent 75C for 30 seconds. Probe the thickest part of poultry, burgers, sausages, and egg dishes. For eggs served runny (fried, poached, soft-boiled), use only Lion Code eggs or pasteurised egg products, and document this decision in your HACCP plan. Cross-contamination prevention is equally critical. Store raw poultry on the lowest shelf of the fridge, below ready-to-eat foods. Use separate colour-coded chopping boards (red for raw meat, green for salad/fruit). Wash hands thoroughly with soap and warm water after handling raw poultry, never just a rinse. Clean and disinfect surfaces and equipment that have contacted raw poultry before preparing other foods. For salads and herbs, wash thoroughly under running water. The FSA does not recommend washing raw chicken, as this spreads bacteria via splash contamination up to a metre from the sink.

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Staff Training and Monitoring

Every member of staff who handles food must understand the Salmonella risk from raw poultry and eggs. Training should cover: why we never wash raw chicken, the importance of handwashing after handling raw meat, correct fridge storage order, and what to do if they suspect they have symptoms (the 48-hour exclusion rule after symptoms stop for any staff member with diarrhoea or vomiting). Monitoring includes daily fridge temperature checks (must be below 8C, ideally below 5C), cooking temperature records with probe readings, and cleaning schedule verification. If a staff member reports a Salmonella diagnosis, they must be excluded from work until cleared by their GP or Environmental Health, typically requiring two consecutive negative stool samples taken at least 48 hours apart.

What to do next

Audit your egg supply

Confirm all eggs used in your kitchen are Lion Code stamped. If you use non-Lion eggs for any purpose, switch to pasteurised liquid egg for dishes that will not be fully cooked.

Implement a raw poultry protocol

Create a documented procedure for receiving, storing, and preparing raw poultry that includes separate storage, dedicated boards and utensils, mandatory handwashing, and probe cooking verification.

Display a "Do Not Wash Chicken" notice

Post a clear reminder near the sink and preparation area. New staff and agency workers often default to washing poultry out of habit.

Common mistakes to avoid

Mistake

Relying on cooking time instead of core temperature

Instead

Oven settings and cooking times vary. Always probe the thickest part of the food and record the core temperature reading.

Mistake

Storing raw poultry above ready-to-eat food in the fridge

Instead

Raw poultry must always be on the lowest shelf to prevent drip contamination onto cooked or ready-to-eat items below.

Frequently asked questions

Can Salmonella survive freezing?

Yes. Freezing does not kill Salmonella - it puts the bacteria into a dormant state. When the food thaws, the bacteria become active again and can multiply if the food enters the danger zone (8C to 63C). Always cook frozen poultry thoroughly after defrosting, and never refreeze raw meat that has been thawed at room temperature.

Is it safe to serve runny eggs in a restaurant?

Yes, provided you use Lion Code eggs from vaccinated UK flocks. The FSA revised its guidance in 2017 to confirm that Lion Code eggs are safe to serve runny to most consumers, including pregnant women. Non-Lion eggs and imported eggs should always be cooked thoroughly. Document your egg sourcing in your HACCP plan.

How long can Salmonella survive on kitchen surfaces?

Salmonella can survive on dry stainless steel surfaces for up to 24 hours and on plastic chopping boards for even longer, particularly in the presence of food residues. This is why cleaning and disinfecting surfaces between tasks (especially after handling raw poultry) is essential, not optional.

What should I do if a customer reports suspected Salmonella food poisoning?

Take the complaint seriously and record all details: what they ate, when, and their symptoms. Preserve any food samples from the same batch if possible. Notify your manager immediately. If Environmental Health contacts you, cooperate fully and provide access to your HACCP records, temperature logs, and supplier documentation.

Food Safety Hazards