22 Hazards, Contamination & Allergens Practice Questions & Answers

1. 1. A manager is evaluating a new house-made salad to decide whether it requires time and temperature control for safety. Which combination of intrinsic characteristics MOST strongly indicates that the product is a TCS food?

   • A.Very little available moisture, a strongly acidic formulation, and abundant protein or starch
   • B.Ample available moisture, a near-neutral acidity level, and abundant protein or starch✓ Answer
   • C.Very little available moisture, a near-neutral acidity level, and abundant protein
   • D.Ample available moisture, a strongly acidic formulation, and little protein or starch

   TCS status depends on intrinsic factors acting together: bacteria need available water, an acidity level that is not strongly acidic, and nutrients such as protein or carbohydrate. Removing any one of those supports — drying the product or acidifying it enough — can make the food non-TCS, so the moist, near-neutral, nutrient-rich product is the one that must be kept under temperature control.

   Source: FDA Food Code, definition of time/temperature control for safety food based on the interaction of water activity, pH, and nutrient contentReport a problem with this question

2. 2. Your operation begins delivering meals to a residential facility whose residents are elderly and immunocompromised. What does serving this highly susceptible population MOST change about the manager's menu decisions?

   • A.Nothing on the menu changes as long as the kitchen cooks every item thoroughly first
   • B.Raw animal foods may be served if each resident signs a form accepting the risk first
   • C.Raw or undercooked animal foods come off the menu, with pasteurized products substituted✓ Answer
   • D.A written consumer advisory on the menu still allows raw or undercooked items to be served

   Highly susceptible populations become seriously ill from doses of a pathogen that healthy adults tolerate, so raw or undercooked animal foods, raw seed sprouts, unpasteurized juice, and unpasteurized milk may not be served to them and pasteurized products must be substituted. A consumer advisory is only a disclosure and a reminder for other guests; it does not make these items acceptable for this population.

   Source: FDA Food Code, prohibition on serving certain raw or undercooked foods to highly susceptible populationsReport a problem with this question

3. 3. While training shift supervisors, a manager explains how different pathogens make people sick. Which description matches a foodborne INTOXICATION?

   • A.A chemical residue left on a food-contact surface transfers into the food
   • B.A pathogen swallowed with the food multiplies in the intestines and causes illness
   • C.A pathogen swallowed with the food produces a toxin once it reaches the intestines
   • D.A toxin already present in the food at the moment it is eaten causes the illness✓ Answer

   In an intoxication the toxin is formed in the food before it is eaten, so killing the organism afterward does not make the food safe; an infection requires the live pathogen to grow in the body, and a toxin-mediated infection involves an organism that produces its toxin after it reaches the intestines. Knowing which mechanism applies tells the manager whether the cook step can be a control at all.

   Source: FDA Food Code hazard definitions and food protection manager content outline, foodborne infection, intoxication, and toxin-mediated infectionReport a problem with this question

4. 4. Sliced roast beef was handled with bare hands, left at room temperature for much of the afternoon, then reheated thoroughly before service. Guests became ill within a few hours. Which explanation BEST fits what happened?

   • A.A toxin made by bacteria from a handler's skin and nose stayed active through reheating✓ Answer
   • B.A virus from the handler's hands multiplied in the beef and survived the reheating step
   • C.Spores germinated during reheating and released a toxin as the beef was portioned
   • D.Mold growing inside the beef produced a toxin that reheating spread through the product

   Staphylococcus aureus is carried on the skin and in the nose of healthy people, moves to ready-to-eat food through bare-hand contact, and forms a heat-stable toxin while the food sits in the danger zone. Reheating destroys the bacteria but not the toxin, which is why the manager's controls are hand hygiene, no bare-hand contact with ready-to-eat food, and temperature control rather than a hotter reheat.

   Source: FDA Food Code, prohibition of bare-hand contact with ready-to-eat food and the heat-stable nature of staphylococcal toxinReport a problem with this question

5. 5. A manager's temperature logs are complete and accurate, yet the operation is still exposed to norovirus and hepatitis A. Why is temperature control alone an inadequate control for these hazards?

   • A.These viruses are destroyed by ordinary cooking, so only the holding step matters here
   • B.These viruses grow only in acidic foods, which are normally held outside the danger zone
   • C.These viruses grow fastest under refrigeration, so cold holding speeds their multiplication
   • D.These viruses do not grow in food, so control depends on hygiene, sourcing, and excluding ill workers✓ Answer

   Viruses need a living host to replicate, so they never multiply in food; they are carried in by infected people or contaminated water and simply survive there. Because there is no growth to slow, temperature control does nothing, and the chain is broken instead by handwashing, no bare-hand contact with ready-to-eat food, excluding ill employees, and buying shellfish from approved sources.

   Source: FDA Food Code, employee health exclusions, no-bare-hand-contact rule, and approved source requirements addressing viral pathogensReport a problem with this question

6. 6. Why do refrigerated, ready-to-eat foods such as deli meats, soft cheeses, and smoked seafood get special attention in a manager's food safety plan?

   • A.A parasite associated with them keeps reproducing in the food while chilled
   • B.A mold associated with them releases its spores only during cold storage
   • C.A virus associated with them multiplies inside sealed vacuum packages
   • D.A bacterium associated with them keeps growing at cold-holding temperatures✓ Answer

   Listeria monocytogenes tolerates cold and multiplies slowly even at proper cold-holding temperatures, so refrigeration slows the hazard instead of stopping it. That is why these ready-to-eat foods depend on limiting how long they are held, on sanitation of the slicers and surfaces that touch them, and on protecting them from contamination after the cook step.

   Source: FDA Food Code, controls for refrigerated ready-to-eat time/temperature control for safety food and cold-tolerant pathogensReport a problem with this question

7. 7. A large batch of beef gravy is cooked to its required temperature, cooled slowly overnight in a deep covered pot, and served the next day. Several guests become ill. Which explanation BEST identifies the failure?

   • A.Bacteria transferred from the surface of the cooking equipment when it was reheated
   • B.Spores surviving normal cooking germinated and multiplied while the gravy sat in the danger zone✓ Answer
   • C.A handler contaminated the gravy with bare hands while portioning it for service
   • D.The cook step never reached a temperature high enough to destroy the vegetative cells

   Spore-forming bacteria such as Clostridium perfringens survive normal cooking, so the cook step can never be the control for them; when a dense batch cools slowly the spores germinate and the cells multiply to an infectious level. The manager's control is rapid cooling in shallow portions and proper reheating, not a hotter or longer cook.

   Source: FDA Food Code, cooling and reheating provisions addressing spore-forming bacteria in large batchesReport a problem with this question

8. 8. Guests who ate seared tuna report a peppery, burning taste in the mouth, flushing, and hives soon after the meal. The tuna was cooked to its required temperature. What does this tell the manager about controlling this hazard?

   • A.It is a mold toxin, so control rests on stock rotation and discarding fish with growth
   • B.It is a bacterium killed by cooking, so the cook step failed and cooking logs need review
   • C.It is a parasite in the flesh, so control rests on freezing the fish before cooking
   • D.It is a toxin formed before delivery, so control rests on sourcing and receiving checks✓ Answer

   Scombroid poisoning is caused by histamine that bacteria form in tuna and similar fish when the fish is temperature abused before it reaches the operation. Histamine is heat stable and cannot be cooked, frozen, or smelled out of the fish, so the only real controls are buying from approved, reputable suppliers and verifying temperature and condition at receiving.

   Source: FDA Food Code, approved source requirement and histamine control for scombrotoxin-forming fishReport a problem with this question

9. 9. A chef proposes adding large predatory reef fish such as barracuda and amberjack to the menu. Guests poisoned by the toxin these fish can carry classically report a reversal of hot and cold sensation. What is the ONLY effective control?

   • A.Rejecting any fillet with an off odor at the receiving dock
   • B.Buying the fish only from approved, reputable suppliers✓ Answer
   • C.Cooking the fish to a higher temperature than other fish
   • D.Freezing the fish solid before it is thawed and cooked

   Ciguatoxin accumulates in reef predators through the food chain and cannot be smelled, tasted, cooked, frozen, or trimmed out of the flesh, so nothing done inside the operation removes it. The hazard is controlled entirely upstream, by buying from suppliers who avoid implicated species and harvest areas.

   Source: FDA Food Code, approved source requirement for fish associated with ciguatera toxinReport a problem with this question

10. 10. Minutes after being served, a guest is flushed and covered in hives and says her throat feels tight. What should the manager do?

    • A.Bring the guest water and wait to see whether the symptoms ease on their own
    • B.Ask the guest to list every ingredient she ate before deciding what to do
    • C.Offer to remake the dish without the allergen and comp the whole meal
    • D.Call for emergency medical help at once and keep the food that was served✓ Answer

    Hives together with throat tightness point to anaphylaxis, which can progress to airway closure within minutes, so emergency medical help must be summoned immediately rather than after observation. Keeping the plate and any product packaging lets the operation and the investigators identify the allergen source afterward.

    Source: FDA Food Code, person-in-charge duty for food allergy awareness, including recognition of the symptoms of an allergic reactionReport a problem with this question

11. 11. A chef wants to add a raw marinated fish dish to the menu. Which hazard-and-control pairing should the manager plan around?

    • A.Mold in the fish, controlled by trimming any fillet surface that has darkened
    • B.Bacterial spores in the fish, controlled by holding the dish above the danger zone
    • C.Parasites in the fish, controlled by a validated freezing procedure before service✓ Answer
    • D.Parasites in the fish, controlled by marinating in acidic citrus juice before service

    Fish intended to be served raw or undercooked must be frozen and held under a procedure that destroys parasites, or bought from a supplier who documents that the freezing was done. Acid marinades, ordinary refrigeration, and trimming do not kill parasites, and the manager must keep the supplier's or the operation's records of the treatment.

    Source: FDA Food Code, parasite destruction requirement and records for fish served raw or undercookedReport a problem with this question

12. 12. During a walk-through, the person in charge sees a cook mixing a large batch of lemonade in a galvanized tub. What is the PRIMARY concern?

    • A.The tub's seams are hard to clean and can trap soil residue
    • B.The tub chills the lemonade faster than the recipe intends
    • C.Acid in the lemonade can dissolve metal from the tub into the drink✓ Answer
    • D.The tub will tint the lemonade and make it look unappetizing

    Acidic foods and beverages dissolve zinc, copper, and similar metals out of unsuitable containers, and the dissolved metal is a chemical hazard that causes rapid-onset illness. Acidic items may be prepared and stored only in food-grade, nonreactive equipment, so the manager stops the batch and moves it to an approved container.

    Source: FDA Food Code, prohibition on using galvanized, copper, and similar reactive materials in contact with acidic foodsReport a problem with this question

13. 13. A self-inspection finds a spray bottle of degreaser on a shelf above clean sheet pans, plus an unlabeled bottle of pink liquid at a prep sink. Which corrective action addresses both findings?

    • A.Leave the chemicals on the shelf, move the clean pans down to a lower rack, and label the bottle
    • B.Relocate both chemicals below and away from food and equipment, and label the working container✓ Answer
    • C.Keep the labeled bottle in place and mark the other one with the color of its contents
    • D.Pour both bottles out at the mop sink and reorder chemicals in single-use packets

    Poisonous or toxic materials must be kept in a designated area that is separated from and below food, equipment, utensils, and single-service items so a leak, drip, or overspray cannot reach them. Any working container filled from a bulk supply must also carry the common name of the chemical, because an unidentified container invites misuse.

    Source: FDA Food Code, storage separation requirements for poisonous or toxic materials and identification of working containersReport a problem with this question

14. 14. The closing crew sprays oven degreaser while a rack of unwrapped rolls cools nearby, and a cook adds extra sanitizer concentrate to a bucket "so it works better" without testing it. Which hazard do both practices create?

    • A.Biological contamination from spores surviving on surfaces
    • B.Allergen cross-contact from residues left on the surfaces
    • C.Physical contamination from packaging and equipment debris
    • D.Chemical contamination of food and food-contact surfaces✓ Answer

    Both practices put cleaning chemical where food or a food-contact surface will pick it up: aerosolized degreaser drifts onto exposed food, and an over-strength sanitizer leaves residue on surfaces. Sanitizer is safe and effective only at the concentration its label specifies, verified with the matching test strips, and cleaners must never be applied near exposed food.

    Source: FDA Food Code, requirements for the use of poisonous or toxic materials and application of sanitizers at labeled concentrationReport a problem with this question

15. 15. Two guests return dishes containing thin metal slivers. Both dishes were made from canned product opened at the same station. What is the MOST likely source and the manager's correct response?

    • A.The strainer used to drain the product; replace it and rewash the utensils
    • B.A dented can received that day; retrain receiving staff on rejecting cans
    • C.A worn can-opener blade; take the opener out of service and inspect it✓ Answer
    • D.Staples in the shipping carton; move case cutting away from the prep line

    A worn or chipped can-opener blade sheds metal shavings straight into the product as each can is opened, which fits slivers appearing in two dishes from a single opening station. Equipment with food-contact surfaces must be kept in good repair, so the manager removes the opener from service, inspects the blade, and discards product opened with it.

    Source: FDA Food Code, equipment good-repair and maintenance requirements to prevent physical contamination from food-contact surfacesReport a problem with this question

16. 16. A person in plain work clothes is walking through the prep area saying he was sent to service a piece of equipment, and no manager on duty arranged the visit. What should the person in charge do?

    • A.Let the visitor finish and record the name and company in the visitor log later
    • B.Stop the visit, verify the work order with an approved vendor, and escort any authorized worker✓ Answer
    • C.Send the visitor to the dock to wait, and continue prep with food left uncovered
    • D.Allow the work to continue but ask a cook to watch the visitor while prep goes on

    Food defense rests on controlling who has access to food, ingredients, and equipment, so an unverified visitor must never work unsupervised in a food area. The manager stops the activity, confirms the visit against an approved vendor and work order, escorts anyone who turns out to be authorized, and reports a visitor who cannot be verified.

    Source: FDA Food Code and food defense guidance, protecting food from deliberate contamination by controlling access of non-employeesReport a problem with this question

17. 17. In a hazard analysis, how should the presence and growth of microorganisms in a food be classified?

    • A.A quality defect, like an off odor in storage
    • B.A biological hazard, like bacterial growth✓ Answer
    • C.A physical hazard, like broken glass fragments
    • D.A chemical hazard, like sanitizer residue on a pan

    Hazards are grouped as biological, chemical, or physical, and every living agent — bacteria, viruses, parasites, and fungi — plus the toxins they produce falls in the biological group. Classifying the hazard correctly is what tells the manager which control applies: a cook or hygiene control for biological hazards, storage and labeling for chemical, and equipment condition for physical.

    Source: FDA Food Code hazard definitions, classification of hazards as biological, chemical, or physicalReport a problem with this question

18. 18. A manager is writing the operation's allergen procedure. Which statement correctly distinguishes cross-contact from cross-contamination?

    • A.Cross-contact occurs only during storage; cross-contamination occurs only during cooking
    • B.Cross-contact transfers an allergen protein into a food; cross-contamination transfers pathogens✓ Answer
    • C.Cross-contact transfers pathogens between foods, while cross-contamination transfers allergen proteins
    • D.Cross-contact applies only to packaged food; cross-contamination only to food made in house

    Cross-contact is the transfer of an allergen protein from one food to another, while cross-contamination is the transfer of pathogens or other contaminants. The difference drives the corrective action: pathogens can be destroyed by cooking or sanitizing, but the allergen protein cannot, so a cross-contact incident is corrected only by discarding the food and remaking it.

    Source: FDA Food Code, definition of food allergen cross-contact and the person-in-charge duty for allergen awareness trainingReport a problem with this question

19. 19. A cook plates an order for a guest who declared a nut allergy, then notices the tongs used for the garnish had just handled a nut-topped bread. What must the manager direct?

    • A.Remake the order with washed hands, clean gloves, and cleaned and sanitized tools✓ Answer
    • B.Remove the garnish, wipe the rim of the plate, and send the order with a note
    • C.Send the order and have the server point out what the guest should leave uneaten
    • D.Send the dish back to be cooked longer, since heat breaks down the allergen protein

    Food allergens are proteins that cooking, freezing, and sanitizing do not destroy, and a trace amount is enough to trigger a reaction, so removing the visible ingredient or wiping the plate leaves the allergen behind. Once an allergy order has been touched by an allergen the only acceptable correction is to discard it and prepare a fresh one with clean hands, gloves, and equipment.

    Source: FDA Food Code, prevention of food allergen cross-contact and the person-in-charge duty for food allergy awarenessReport a problem with this question

20. 20. A guest with a fish allergy orders french fries. The fryer that cooks the fries is also used for breaded fish. What should the manager have the server tell the guest?

    • A.The fries are safe if the oil was filtered and changed at the start of this shift
    • B.The fries cannot be cooked in that oil; offer a dish made with dedicated equipment✓ Answer
    • C.The fries are safe as long as the fish is fried in a basket kept separate from them
    • D.The fries are safe because frying temperatures break down the allergen residues in oil

    Allergen protein from the fish and its breading stays in shared frying oil and transfers to everything else cooked in it; frying heat does not destroy it and a separate basket does not separate the oil. An allergy order must be made with dedicated equipment and oil, or the guest must be told honestly that the item cannot be prepared safely.

    Source: FDA Food Code, prevention of food allergen cross-contact through shared equipment and cooking mediaReport a problem with this question

21. 21. A guest asks a server whether a dish contains a specific allergen, and the server does not know. What procedure should the manager have trained the staff to follow?

    • A.Suggest the guest order it and set aside anything with that ingredient in it
    • B.Reassure the guest the dish is probably fine, since that allergen is uncommon
    • C.Check the recipe and product labels with the kitchen, then give an accurate answer✓ Answer
    • D.Tell the guest the kitchen is not able to answer ingredient questions

    The person in charge must ensure that employees can describe dishes and identify ingredients on request as part of their assigned duties, because guesses and reassurance are what put an allergic guest at risk. The trained routine is to verify the recipe and the current product labels with the kitchen or manager and then answer the guest accurately.

    Source: FDA Food Code, person-in-charge duty to ensure employees are trained in food allergy awareness as it relates to their assigned dutiesReport a problem with this question

22. 22. A distributor substitutes a different brand of the same barbecue sauce mid-week. Before that sauce is used in dishes served to guests with allergies, what must the manager do?

    • A.Compare the price and case size and keep using the recipe card already posted
    • B.Ask the delivery driver whether anything changed and note it on the invoice
    • C.Read the new product's ingredient label and update the allergen information✓ Answer
    • D.Assume the ingredients match, since the product name and use are the same

    Manufacturers reformulate products and different brands of the same item routinely carry different ingredients, so the label on the product actually in the building is the only reliable source of allergen information. The manager reads that label and updates the recipe cards and allergen list before the product reaches a guest with an allergy.

    Source: FDA Food Code and federal food allergen labeling requirements, use of manufacturer labels to identify major food allergens in purchased productsReport a problem with this question

Practice questions based on the FDA Food Code and the published content areas used by ANSI/ANAB-CFP accredited food protection manager exams. Not affiliated with ServSafe® or the National Restaurant Association. Requirements are set by your regulatory authority, and jurisdictions adopt different editions of the model code — confirm the rules and thresholds that apply to your operation with your local health department before your exam. FDA Food Code →