Cross-Contamination

Cross-contamination is the unintended transfer of harmful microorganisms or other contaminants from one food, surface, utensil, person or piece of equipment to another. In a professional kitchen, it is a major food-safety risk when raw foods contact ready-to-eat foods or when contaminated hands and equipment spread pathogens.

Common kitchen examples

• Cutting raw chicken on a board and then slicing tomatoes on the same board without effective cleaning and sanitizing.
• Storing raw meat above uncovered ready-to-eat food where juices can drip.
• Using the same tongs for raw and cooked food.
• Handling waste or raw ingredients and then touching ready-to-eat food without proper handwashing.
• Using an inadequately cleaned slicer or food processor for different products.

How to prevent cross-contamination

Separate raw and ready-to-eat foods, store products in the correct order, use clean and sanitized equipment, wash hands at the required times and keep work areas organized. Colour-coded boards and utensils can support separation, but the colour system must be consistent, documented and understood by staff. Colour alone does not make equipment safe.

Cross-contamination versus allergen cross-contact

Cross-contamination commonly describes the transfer of microorganisms or other contaminants. Allergen cross-contact describes the unintended transfer of allergenic proteins and requires additional controls, because ordinary cooking does not reliably destroy allergens.

Chef’s tip: Change gloves when required, but remember that gloves do not replace handwashing. Clean and sanitize equipment between tasks according to the approved procedure.

Key distinction: Cross-contamination is the transfer of hazards between foods or surfaces; it is not limited to raw chicken and vegetables, and it can occur through hands, equipment, storage and service.