Cross-Contamination

Cross-contamination is the transfer of pathogens from one surface or food to another. It is one of the most common causes of foodborne illness outbreaks.

• Direct cross-contamination happens when contaminated food touches other food — raw chicken juices dripping onto lettuce, for example.
• Cross-contamination can also be indirect, spreading through unwashed hands, gloves, sponges, or towels moving between tasks.
• Equipment is a frequent culprit: slicers, can openers, blender gaskets, ice scoops and cutting boards that were not cleaned and sanitized between uses.
• The highest-risk transfer is always raw animal protein → ready-to-eat food, because there is no cooking step left to kill what you transferred.

Physical separation is the simplest control: if raw and ready-to-eat food never share space, they cannot contaminate each other.

• Store raw meat, poultry, and seafood below ready-to-eat foods in the refrigerator so drips can't contaminate them.
• Where possible, use separate coolers or separate shelves for raw protein and ready-to-eat items.
• Keep all food in covered, labeled containers, and never store food directly under exposed sewer or water lines.
• Never rinse raw poultry in the prep sink — splashing spreads bacteria onto surfaces and nearby food up to several feet away.
• Never place cooked food back on a plate or board that held raw meat — a classic grilling mistake that causes outbreaks.

Color coding turns a rule into something you can see at a glance, which is why most kitchens adopt it.

• Use color-coded cutting boards and utensils (for example, red for raw meat, yellow for raw poultry, blue for seafood, green for produce, white for dairy and bakery).
• Never reuse a board for ready-to-eat food without washing and sanitizing it first.
• Wash, rinse, and sanitize any surface or utensil that touched raw protein before it touches ready-to-eat food.
• Replace cutting boards that are deeply scored or grooved — scratches harbor bacteria that cleaning can't reach.
• Keep a dedicated set of tools for allergen orders and for raw protein; label them clearly so they aren't mixed back into general use.

When space or equipment is limited, time becomes your separator: sequence tasks so contamination has nowhere to travel.

• Prep ready-to-eat food first, then raw protein — or use different times of day for each.
• If you must use the same surface, clean and sanitize thoroughly between tasks, and change gloves and wash hands.
• Prep raw poultry last among proteins, since it carries the highest pathogen load.
• Keep wiping cloths in a sanitizer bucket at the correct concentration, and use separate cloths for raw-protein surfaces.
• Move food and staff in one direction — from dirty to clean — through the kitchen, never doubling back with contaminated items.