A study from the Institute of Food Research has shown that campylobacters persistence in food processing sites and the kitchen is boosted by chicken juice.

Organic matter exuding from chicken carcasses (chicken juice) provides these bacteria with the perfect environment to persist in the food chain. This emphasises the importance of cleaning surfaces in food preparation and may lead to more effective ways of cleaning that can reduce the incidence of campylobacter.

The researchers collected the liquids produced from defrosting chickens and found that this helped campylobacter attach to surfaces and, subsequently, form biofilms. Biofilms are specialised structures some bacteria form on surfaces that protect them from threats from the environment.

"We have discovered that this increase in biofilm formation was due to chicken juice coating the surfaces we used with a protein-rich film," says researcher Helen Brown. "This film then makes it much easier for the campylobacter bacteria to attach to the surface, and it provides them with an additional rich food source."

Campylobacter arent particularly hardy bacteria, so one area of research has been to understand exactly how they manage to survive outside of their usual habitat – the intestinal tract of poultry. They are sensitive to oxygen, but during biofilm formation the bacteria protect themselves with a layer of slime. This also makes them more resistant to antimicrobials and disinfection treatments.

Understanding this and how campylobacter persists in the food production process will help efforts to reduce the high percentage of chickens that reach consumers contaminated with the bacteria. Although thorough cooking kills off the bacteria, around 500,000 people suffer from campylobacter food poisoning each year in the UK.