FSA Review: Why Cross-Contamination Still Matters When Cooking Chicken

A new Food Standards Agency review has examined how retailers, households, restaurants and caterers can reduce Campylobacter in chicken. Its practical conclusion is clear: cooking remains the most reliable final control, but the journey from raw chicken to the plate also matters enormously.

Campylobacter is commonly associated with raw poultry. The review assessed several intervention points, including cooking, chilling, freezing, hygiene and measures intended to prevent bacteria moving between foods. It is an evidence review rather than a product test, and it does not claim that one kitchen habit can eliminate every food-safety risk.

Cooking is still the decisive step

Across the evidence examined, heating chicken throughout to at least 70°C reduced Campylobacter to undetectable levels within minutes. Higher temperatures and longer cooking times generally produced greater reductions, although results varied according to the cut of chicken, cooking method, starting contamination and the way researchers measured the outcome.

For home cooks, that means the centre of the thickest part matters more than the colour of the surface. A clean food thermometer gives a more dependable check than judging doneness by appearance alone. The thermometer should be inserted into the thickest section without touching bone, and the chicken should not be served until the internal temperature has reached the recommended benchmark throughout.

The review does not turn 70°C into a universal cooking time. A thin fillet, a bone-in piece and a whole bird heat at different speeds, so a fixed number of minutes cannot provide the same assurance in every kitchen. The useful message is to combine the right temperature with an appropriate cooking method and to check the part that warms most slowly.

The overlooked risk happens before cooking

Cooking can make contaminated chicken safer, but it cannot undo contamination that has already spread to ready-to-eat food. The review highlights cross-contamination from raw chicken to hands, knives, chopping boards, worktops, packaging and other ingredients as a major pathway. Modelling studies reviewed by the authors suggest that this route may be more common than undercooking itself.

That is why washing raw chicken is a poor trade-off. Rinsing can splash contaminated water around the sink and nearby surfaces without making the meat safe to eat. The safer sequence is to take the chicken directly from its packaging to the preparation area, keep salads and other ready-to-eat ingredients away from it, and wash hands, utensils and surfaces with hot water and soap or detergent after contact.

Kitchen order also helps. Prepare foods that will be eaten raw before handling poultry, or use separate equipment for each task. If the same board must be used, clean it thoroughly before it touches bread, vegetables, herbs or cooked food. A clean plate is also needed for cooked chicken; returning it to the plate that held the raw meat can reintroduce bacteria after cooking has done its job.

Cold storage is not a substitute for heat

The review found that chilling and freezing can reduce Campylobacter, but their effects are less consistent and should not be treated as a safety guarantee. Refrigeration for up to three days produced little reduction in the evidence assessed. Longer chilling sometimes performed better, but it may be impractical because raw chicken can deteriorate before the extra time provides a meaningful benefit.

Freezing tended to produce larger reductions when chicken remained frozen for more than three weeks, yet surviving bacteria were still observed. Freezing therefore changes the level of contamination rather than reliably eliminating it. Once the chicken is thawed, normal handling precautions still apply, and the meat must be cooked thoroughly.

What the evidence can—and cannot—tell us

The FSA review brings together studies using different chicken cuts, temperatures, cooking systems and contamination levels. Some experiments used artificially inoculated meat, and several findings came from models rather than direct observations of illness in households. The authors therefore identify useful patterns rather than promising that a particular intervention will deliver the same reduction in every real kitchen.

That qualification makes the central message more useful, not less. Cooking provides the strongest final barrier, while clean handling reduces the chance that bacteria will reach food that will not be cooked. Chilling and freezing can support a broader food-safety system, but neither replaces careful preparation or adequate heat.

A practical routine for safer chicken

• Keep raw chicken and its packaging away from ready-to-eat food.
• Do not rinse raw chicken in the sink.
• Wash hands, boards, knives and worktops after handling it.
• Use a food thermometer to check the thickest part reaches at least 70°C.
• Serve cooked chicken on a clean plate and keep it separate from raw meat.

For everyday cooking, the review’s lesson is straightforward: the thermometer is the final checkpoint, not the entire safety plan. A well-cooked piece of chicken can still create a problem if raw juices have reached the salad, the chopping board or the serving plate. Treating cooking and cross-contamination control as two linked steps gives home kitchens a more reliable defence against Campylobacter.

Sources

• Official source: science.food.gov.uk
• https://science.food.gov.uk/article/161540-interventions-applied-at-retail-consumer-restaurant-and-catering-settings-to-reduce-the-levels-of-_campylobacter_-spp