FOODSAFE Cross-Contamination Prevention 1 — Questions and Answers
Question 1: What is cross-contamination in a food service context?
- Mixing two different recipes together
- The transfer of harmful microorganisms or substances from one food, surface, or person to another (Correct answer)
- Cooking two foods in the same oven
- Serving food from different countries on the same plate
Correct answer: The transfer of harmful microorganisms or substances from one food, surface, or person to another
Cross-contamination is the transfer of pathogens or harmful substances from a contaminated source (raw food, dirty surfaces, unwashed hands) to a previously safe food or surface. It is one of the leading causes of food-borne illness.
Question 2: Which is the most effective way to prevent cross-contamination between raw and ready-to-eat foods?
- Cooking both foods to the same temperature
- Using separate cutting boards, utensils, and storage areas for raw and ready-to-eat foods (Correct answer)
- Washing raw food before placing it near ready-to-eat food
- Keeping both foods at the same temperature
Correct answer: Using separate cutting boards, utensils, and storage areas for raw and ready-to-eat foods
Physical separation is the most effective method. Using dedicated colour-coded cutting boards, separate utensils, and designated storage areas for raw versus ready-to-eat foods eliminates direct and indirect contact between them.
Question 3: In a refrigerator, where should raw meats be stored relative to ready-to-eat foods?
- On the top shelf above ready-to-eat foods
- On the lowest shelf, below ready-to-eat foods, to prevent dripping onto other items (Correct answer)
- Mixed together on any shelf
- In the door compartment
Correct answer: On the lowest shelf, below ready-to-eat foods, to prevent dripping onto other items
Raw meats must be stored on the lowest shelf to prevent juices from dripping onto ready-to-eat foods below. Ready-to-eat items go on upper shelves. Raw poultry goes on the very bottom as it carries the highest risk.
Question 4: A food handler uses a knife to cut raw chicken, rinses the knife under water, and then uses it to slice bread. Is this acceptable?
- Yes, rinsing removes all bacteria
- No, the knife must be washed with hot soapy water and sanitized before being used on ready-to-eat food (Correct answer)
- Yes, if the bread will be toasted
- Yes, as long as the knife looks clean
Correct answer: No, the knife must be washed with hot soapy water and sanitized before being used on ready-to-eat food
Rinsing alone does not remove pathogens. The knife must be washed with hot soapy water to remove food debris and then sanitized to kill remaining bacteria before being used on ready-to-eat foods like bread.
Question 5: What is the purpose of colour-coded cutting boards in a commercial kitchen?
- To match the kitchen decor
- To visually identify which boards are used for specific food types, preventing cross-contamination (Correct answer)
- To indicate the age of each cutting board
- To show which boards belong to which chef
Correct answer: To visually identify which boards are used for specific food types, preventing cross-contamination
Colour-coded cutting boards (e.g., red for raw meat, green for vegetables, blue for fish, yellow for poultry) provide a quick visual system ensuring the correct board is used for each food type, preventing cross-contamination.
Question 6: How does improper handling of wiping cloths contribute to cross-contamination?
- It does not — wiping cloths are always safe
- Using the same cloth to wipe multiple surfaces without sanitizing between uses spreads bacteria from one surface to another (Correct answer)
- Wiping cloths are only a problem if they are wet
- Cross-contamination from cloths only occurs with paper towels
Correct answer: Using the same cloth to wipe multiple surfaces without sanitizing between uses spreads bacteria from one surface to another
A contaminated wiping cloth can spread bacteria across multiple surfaces. Cloths used for wiping should be stored in sanitizer solution between uses and replaced frequently to prevent them from becoming vehicles for cross-contamination.
FOODSAFE Cross-Contamination Prevention 1
What is cross-contamination in a food service context?