TFHC Cross-Contamination Prevention 1 — Questions and Answers
Question 1: What is cross-contamination in a food service setting?
- The transfer of harmful microorganisms from one food or surface to another (Correct answer)
- The mixing of two different types of cuisines in one meal
- Cooking different foods at the same temperature
- Using the same seasoning on multiple dishes
Correct answer: The transfer of harmful microorganisms from one food or surface to another
Cross-contamination occurs when pathogens move from a contaminated source (raw meat, unclean hands, dirty surfaces) to a safe food.
Question 2: Which color cutting board is typically designated for raw poultry in a color-coded system?
- Yellow (Correct answer)
- Red
- Green
- Blue
Correct answer: Yellow
In the standard color-coded cutting board system, yellow boards are used for raw poultry to prevent cross-contamination.
Question 3: What is the safest way to prevent cross-contamination when using the same knife for different foods?
- Wash, rinse, and sanitize the knife between uses on different foods (Correct answer)
- Wipe the knife with a damp cloth between uses
- Rinse the knife under hot water between uses
- Use the knife on raw foods last to reduce risk
Correct answer: Wash, rinse, and sanitize the knife between uses on different foods
The only safe method is the full wash-rinse-sanitize process, which physically removes and kills pathogens between uses.
Question 4: What is cross-contact in the context of food allergies?
- The transfer of an allergen from one food to another through shared surfaces, utensils, or cooking oil (Correct answer)
- Direct physical touching of two different foods
- The chemical reaction between two incompatible ingredients
- Mixing allergen-free foods with regular foods on purpose
Correct answer: The transfer of an allergen from one food to another through shared surfaces, utensils, or cooking oil
Cross-contact with allergens occurs when even trace amounts of an allergen transfer to an allergen-free food through utensils, surfaces, or frying oil.
Question 5: A food worker handles raw shrimp and then touches the handle of a refrigerator door without washing their hands. This is an example of what?
- Cross-contamination via a contaminated surface (fomite) (Correct answer)
- Proper food handling technique
- Time-temperature abuse
- Physical food contamination
Correct answer: Cross-contamination via a contaminated surface (fomite)
Touching a surface with contaminated hands transfers pathogens to that surface (fomite), which can then spread to the next person who touches it.
Question 6: How should raw fish, raw beef, and ready-to-eat salad be stored on different shelves in a walk-in cooler?
- Salad on top, raw fish in the middle, raw beef on the bottom (Correct answer)
- Raw beef on top, raw fish in the middle, salad on the bottom
- Raw fish on top, salad in the middle, raw beef on the bottom
- All stored on the same shelf with dividers
Correct answer: Salad on top, raw fish in the middle, raw beef on the bottom
Ready-to-eat foods go on top, then fish (145°F cook temp), then beef (155°F), with the highest-risk raw proteins on the lowest shelves.
TFHC Cross-Contamination Prevention 1
What is cross-contamination in a food service setting?