Cross-contamination

Cross-contamination is the unintended transfer of a contaminant from a source into a food, which in production can involve allergens, micro-organisms or chemical residues passing from one raw material or line to another. For an animal with an intolerance or allergy, traces of an unwanted ingredient may be enough to trigger signs, which is why strict [elimination diets](/glossary/elimination-diet) and [single-protein](/glossary/single-protein) recipes need dedicated lines or validated cleaning protocols (FEDIAF). At home, cross-contamination is also a concern, especially with [raw](/glossary/raw) diets, where the same board, utensil or bowl can transfer [Salmonella](/glossary/salmonella) or [Listeria](/glossary/listeria) into the family kitchen, so good practice includes thorough washing, dedicated surfaces and separating raw from ready-to-eat foods. In the factory, control rests on [HACCP](/glossary/haccp), flow organisation and cleaning between batches, while a may-contain-traces statement on a label reflects a residual risk that cannot be fully excluded (FDA). For sensitive animals, choosing products made on segregated lines offers a meaningful extra layer of protection. The marker: cross-contamination is the reason a clean ingredient list is not the whole story, since what a food touches in production and at home matters too, a thread connecting many safety entries in the [Petipedia glossary](/glossary).

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