Food Safety Hazards

Campylobacter: The UK's Most Common Foodborne Pathogen

Controlling Campylobacter in Food Businesses

Campylobacter is the most common cause of bacterial food poisoning in the UK by a significant margin, responsible for an estimated 500,000 cases every year according to the FSA. Around four in five cases are linked to contaminated poultry. Unlike Salmonella, which has been reduced through vaccination programmes, Campylobacter remains stubbornly prevalent in the UK chicken supply chain. The bacteria colonise the gut of live birds and contaminate carcasses during slaughter and processing. For food businesses, Campylobacter control is fundamentally about how you handle and cook chicken, and how effectively you prevent cross-contamination from raw poultry to ready-to-eat foods.

Key takeaways

Campylobacter causes around 500,000 cases of food poisoning in the UK annually, more than any other bacterium.

Assume all raw chicken is contaminated - your controls must work on that basis.

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

Cooking to 75C (or 70C for 2 minutes) destroys Campylobacter completely.

Cross-contamination during preparation is a bigger risk than undercooking in many kitchens.

Why Campylobacter Is So Prevalent

Campylobacter jejuni and Campylobacter coli account for almost all human cases. The primary reservoir is poultry, with FSA retail surveys consistently finding Campylobacter on a high proportion of fresh chicken sold in the UK, though the percentage testing positive at the highest contamination levels has fallen thanks to industry intervention. The bacteria also occur in raw milk, untreated water, red meat, and can be carried by pets and wild birds. What makes Campylobacter particularly problematic for kitchens is its low infectious dose: as few as 500 organisms can cause illness, compared to typically 10,000 or more for Salmonella. This means even minor cross-contamination incidents, such as a splash from washing raw chicken or touching a ready-to-eat salad after handling raw poultry without washing hands, can be enough to cause illness.

The Chicken Supply Chain Problem

Campylobacter is so widespread in poultry flocks that it is effectively impossible to guarantee Campylobacter-free raw chicken at retail. The FSA has worked with major processors on interventions including improved biosecurity on farms, rapid surface chilling of carcasses (which reduces bacterial counts), and better slaughter hygiene. These measures have reduced the proportion of the most heavily contaminated chickens, but the bacteria persist. For food businesses, this means you must assume that every piece of raw chicken entering your kitchen carries Campylobacter. Your HACCP plan should treat all raw poultry as contaminated by default. This is not pessimism; it is the realistic starting point for effective control. Some businesses are moving toward pre-portioned chicken products that reduce the amount of handling required in the kitchen, which in turn reduces cross-contamination opportunities.

Effective Kitchen Controls

Campylobacter is heat-sensitive and is destroyed at 70C for 2 minutes (or 75C for 30 seconds). Thorough cooking with probe verification eliminates the risk in the final product. The greater challenge is preventing cross-contamination during storage and preparation. Store raw chicken in sealed, leak-proof containers on the bottom shelf of the fridge at below 5C. Use dedicated red chopping boards and utensils for raw poultry, and never use them for ready-to-eat foods. Do not wash raw chicken under the tap, as the FSA has demonstrated that this spreads Campylobacter-laden droplets across the sink, taps, nearby surfaces, and up to a metre away. Clean and disinfect all surfaces, sinks, and equipment that have been in contact with raw poultry before any other use. Two-stage cleaning (detergent wash followed by food-safe disinfectant with appropriate contact time) is the minimum standard.

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Staff Illness and Exclusion

Campylobacter infection causes diarrhoea (often bloody), severe abdominal pain, fever, and nausea, typically starting 2 to 5 days after ingestion and lasting up to a week. Staff who develop these symptoms must stop handling food immediately and should not return to food handling duties until at least 48 hours after symptoms cease. Unlike some other pathogens, routine stool sampling is not normally required for Campylobacter before return to work, but Environmental Health may require it in outbreak situations. Managers should foster a culture where staff report illness without fear of losing shifts. A single symptomatic food handler can contaminate multiple dishes over the course of a service, leading to a cluster of cases that is far more damaging to the business than covering one shift.

What to do next

Eliminate raw chicken washing from your kitchen

Brief all staff that raw chicken must never be rinsed or washed. Add this to your induction checklist and display a reminder near preparation sinks.

Designate a raw poultry preparation zone

Where space allows, keep a specific area for raw poultry prep with its own board, knife, and container. Clean and disinfect the zone completely before it is used for anything else.

Record all chicken cooking temperatures

Probe every batch of chicken at the thickest point and record the reading. If it falls below 75C, continue cooking and re-probe before serving.

Common mistakes to avoid

Mistake

Assuming chicken from a reputable supplier is Campylobacter-free

Instead

No supplier can guarantee Campylobacter-free raw chicken. Even premium, free-range, and organic birds carry the bacteria. Your controls must assume contamination.

Mistake

Using the same sink for washing salad and defrosting chicken

Instead

If raw poultry has been in the sink, it must be cleaned and disinfected before any other use, especially before washing salad or fruit that will be served raw.

Frequently asked questions

Why does the FSA focus so much on Campylobacter?

Because it causes more cases of bacterial food poisoning in the UK than all other bacteria combined. The FSA estimates 500,000 cases, 100 deaths, and a cost of around 900 million pounds to the economy each year. Despite significant industry efforts, prevalence in poultry remains high, making it the single biggest bacteriological food safety challenge in the UK.

Can Campylobacter grow on food?

Campylobacter does not multiply well on food at normal temperatures. It requires specific atmospheric conditions (low oxygen) and temperatures between 30C and 45C. However, because the infectious dose is so low (as few as 500 cells), it does not need to grow on the food to cause illness. The bacteria present on raw chicken at the point of purchase are already sufficient to cause infection if they reach the consumer via cross-contamination.

Is Campylobacter killed by freezing?

Freezing reduces Campylobacter numbers significantly (by around 90% according to some studies), but it does not eliminate the bacteria entirely. Frozen chicken should still be treated as potentially contaminated and must be cooked thoroughly after defrosting.

Food Safety Hazards