Norovirus & the Food-Handler Exam: The Illness Rules, Explained and Tested
Sick-worker rules are only a handful of questions on a food handler exam — but they are the ones with no room for guessing. Twenty-four hours or forty-eight? Exclude or restrict? Tell the manager, or the health department? This page covers every rule in that slice, with the Food Code section quoted, so those points are yours before you open the rest of the study guide.
What this covers — and what it does not
Covers: the infection-control portion of the food handler and food protection manager (CFPM) exams — reportable symptoms and diagnoses, the Big 6 pathogens, exclusion versus restriction, the highly-susceptible-population distinction, reinstatement clocks and clearance, hand hygiene and bare-hand contact, and the written vomiting-event plan. All of it from the FDA Food Code 2022 text, section by section.
Does not cover: time and temperature control, cooking and holding temperatures, cooling, HACCP, allergens, receiving, storage, pest control, facilities. Those are most of the exam and none of them are here.
Is not: a food handler course, a certificate, or a substitute for either. ServSafe describes its Food Handler assessment as a 40-question test with a 75% passing score — so you can miss ten questions and still pass. The illness questions should never be among the ten.
The one-sentence answer the exam is looking for
A food handler who is diagnosed with norovirus must be excluded from the establishment, the person in charge must notify the regulatory authority, and the worker is not reinstated until the regulatory authority approves and more than 48 hours have passed since symptoms resolved (or a health practitioner documents they are free of norovirus). — FDA Food Code 2022 §§ 2-201.12(A)(2), 2-201.11(B), 2-201.13(D). The rest of this page is why each clause is there, and where the same exam tries to trip you.
1. Three words that decide most questions
Almost every employee-health question on these exams turns on three defined terms. The definitions are in Food Code § 1-201.10, and they are narrower than everyday usage.
- Exclude — "to prevent a person from working as an employee in a food establishment or entering a food establishment as an employee." Sent home, and not allowed back in the door in a working capacity.
- Restrict — "to limit the activities of a food employee so that there is no risk of transmitting a disease that is transmissible through food and the food employee does not work with exposed food, clean equipment, utensils, linens, or unwrapped single-service or single-use articles." Still at work; nowhere near anything a customer will eat from.
- Highly susceptible population (HSP) — people "more likely than other people in the general population to experience foodborne disease because they are: (1) immunocompromised; preschool age children, or older adults; and (2) obtaining food at a facility that provides services such as custodial care, health care, or assisted living." Both halves must be true. A restaurant full of retirees is not an HSP; a nursing-home kitchen serves one.
Two more that matter for the manager exam: the person in charge (PIC) is whoever is present and responsible at the time of inspection, and must be there during all hours of operation (§ 2-101.11); a conditional employee is someone with a job offer that depends on their answers to health questions — the Code gives them reporting duties before they ever touch food (§ 2-201.11(C)).
2. What must be reported, by whom, to whom
The employee's duty runs to the person in charge, not to the health department. The PIC then has a separate, narrower duty to notify the regulatory authority. Exams test both halves and the difference between them.
| Employee must report to the PIC | Detail |
|---|---|
| Symptoms | Vomiting · diarrhea · jaundice · sore throat with fever · an open or draining infected lesion (boil, wound) that is not properly covered. Not on the list: fever alone, cough, runny nose, headache. |
| Diagnoses (the Big 6) | Norovirus · hepatitis A virus · Shigella spp. · Shiga toxin-producing E. coli (STEC) · typhoid fever (Salmonella Typhi) · nontyphoidal Salmonella. |
| Past illness | Typhoid fever within the past 3 months without antibiotic therapy. |
| Exposure | Ate or prepared food implicated in a confirmed outbreak, or lives with / attends a setting with a diagnosed case: norovirus within 48 hours, Shigella/STEC within 3 days, typhoid within 14 days, hepatitis A within 30 days of the last exposure. |
| The detail to include | The date of onset — every reinstatement clock counts from it. |
When the PIC must notify the regulatory authority: only when an employee is jaundiced or diagnosed with one of the Big 6 (§ 2-201.11(B)). Undiagnosed vomiting, sore throat with fever and exposures are handled by exclusion or restriction without a call to the health department. The manager exam also expects you to know that employees must be told of their reporting duty "in a verifiable manner" (§ 2-103.11(P)) — in practice, a signed acknowledgement.
3. Exclude or restrict? The decision table
This is § 2-201.12 laid out the way the exam asks it. Read down the left column for the situation, then across for the establishment type.
| Situation | Serves an HSP | Does not serve an HSP |
|---|---|---|
| Vomiting or diarrhea (infectious cause), diagnosed or not | Exclude | Exclude |
| Jaundice with onset in the last 7 days (no practitioner's note ruling out hepatitis A) | Exclude | Exclude |
| Diagnosed hepatitis A | Exclude | Exclude |
| Diagnosed typhoid fever (or typhoid in past 3 months) | Exclude | Exclude |
| Diagnosed norovirus, no symptoms | Exclude | Restrict |
| Diagnosed Shigella or STEC, no symptoms | Exclude | Restrict |
| Diagnosed nontyphoidal Salmonella, no symptoms | Restrict | Restrict |
| Sore throat with fever | Exclude | Restrict |
| Uncovered infected lesion | Restrict | Restrict |
| Exposed (household contact / outbreak), no symptoms | Restrict | No restriction required |
Three traps the table makes visible. Active vomiting or diarrhea is an exclusion everywhere — the HSP question never arises. Nontyphoidal Salmonella is the odd one out among the asymptomatic diagnoses: restriction in both columns. And an exposure with no symptoms is a restriction only where an HSP is served; in an ordinary restaurant it is reportable but nothing more.
4. Twenty-four hours or forty-eight? Both — for different people
This is the question the practice-test sites on page one of Google disagree about, and the reason they disagree is that each is quoting one half of § 2-201.13. Here is the whole of it, for norovirus:
| The worker | After 24 h asymptomatic | Full reinstatement requires |
|---|---|---|
| Vomiting or diarrhea, no diagnosis | Reinstate. (Or at any time with a practitioner's written statement that the cause is noninfectious.) | Nothing else. No regulatory approval, no note, no test. |
| Diagnosed with norovirus, had symptoms — ordinary establishment | Exclusion is adjusted to a restriction: back at work, not near food. | Regulatory-authority approval and one of: a practitioner's written statement that the worker is free of norovirus; more than 48 hours since symptoms resolved; or (never symptomatic) more than 48 hours since diagnosis. |
| Diagnosed with norovirus, had symptoms — serves an HSP | Exclusion is retained. No step down. | |
| Diagnosed with norovirus, never had symptoms | Was already restricted (or excluded, in an HSP establishment) from the day of diagnosis. |
So "24 hours" is the undiagnosed-symptom rule and "48 hours" is the diagnosed-norovirus rule — and even the 48 hours is not self-executing, because the regulatory authority has to approve. The public-health logic is on our school and daycare page: in the human-challenge study behind CDC's guidance, volunteers were still shedding virus long after they felt well, so the diagnosed case gets the longer clock and the extra check.
5. The Big 6 side by side
The exam will not ask you to recite § 2-201.13(B)–(G), but it will ask which pathogen has which clock. The pattern: viruses clear by time or a practitioner's statement; bacteria can also clear by two negative stool cultures; typhoid clears only by documentation.
| Pathogen | Exposure window | Asymptomatic diagnosis | Time route to reinstatement | Alternative route |
|---|---|---|---|---|
| Norovirus | 48 h | Exclude (HSP) / restrict | > 48 h asymptomatic | Practitioner's statement |
| Hepatitis A | 30 days | Exclude everywhere | > 7 days jaundiced, or > 14 days symptomatic without jaundice | Practitioner's statement |
| Shigella | 3 days | Exclude (HSP) / restrict | > 7 days asymptomatic | 2 negative stool cultures* |
| STEC | 3 days | Exclude (HSP) / restrict | > 7 days asymptomatic | 2 negative stool cultures* |
| Typhoid (S. Typhi) | 14 days | Exclude everywhere | None — no time route | Practitioner's statement that the worker is free of typhoid |
| Nontyphoidal Salmonella | — | Restrict everywhere | > 30 days asymptomatic (restricted meanwhile) | 2 negative stool cultures* |
* Consecutive, taken not earlier than 48 hours after antibiotics stop and at least 24 hours apart, documented by a health practitioner.
6. Hands: the rules the exam always includes
- How long: at least 20 seconds in total, including 10–15 seconds of vigorous rubbing; rinse, soap, rub, rinse, dry — in that order (§ 2-301.12).
- Where: a handwashing sink or approved automatic facility only — never the prep sink, the dish sink or the mop sink (§ 2-301.15).
- When: before food prep; after the toilet; after touching bare body parts; after coughing, sneezing, eating, drinking or tobacco; after handling soiled equipment; when switching from raw to ready-to-eat food; before putting on gloves; and as often as needed (§ 2-301.14). The one carve-out is drinking from a closed container handled to prevent contamination (§ 2-401.11(B)).
- Sanitizer: a hand antiseptic may be applied only to hands that have already been washed (§ 2-301.16(A)(3)). CDC adds that alcohol sanitizer is not a substitute for washing against norovirus specifically — washing physically removes a virus that alcohol handles poorly.
- Bare-hand contact: prohibited with exposed ready-to-eat food; use deli tissue, tongs, spatulas, single-use gloves or dispensing equipment. Exceptions: washing produce, an ingredient that will be cooked to the required temperature, or a regulatory-approved alternative procedure — which needs prior approval, written procedures, a written employee-health policy and documented training, and is never available where an HSP is served (§ 3-301.11).
- Wounds and nails: a bandage on the hand, finger or wrist must be covered by a single-use glove (§ 2-401.13); nail polish and artificial nails only under intact gloves (§ 2-302.11).
- Discharges: persistent sneezing, coughing or a runny nose keeps an employee away from exposed food — but it is not a reportable symptom and not an exclusion (§ 2-401.12).
7. When someone vomits in the establishment
The Food Code requires every establishment to have written procedures for responding to vomiting and diarrheal events (§ 2-501.11). The Code's public-health reasoning (Annex 3) explains why routine cleaning is not enough: norovirus survives on surfaces for at least five days, one vomiting episode can contaminate a space with hundreds of thousands of viral particles and aerosolise them, and some routine sanitizers — including certain quaternary ammonium compounds — may not inactivate it. The plan should cover containment and removal, cleaning then disinfection with a norovirus-effective product, disposal of exposed food, PPE, segregating the area, and applying the exclusion rules to any employee involved.
CDC's figure for the disinfectant: chlorine bleach at 1,000–5,000 ppm (5–25 tablespoons of 5–8% household bleach per gallon of water) left on the surface for at least five minutes, or another EPA-registered product with a norovirus claim. That is ten to a hundred times the 50–100 ppm used for routine food-contact sanitizing — an exam favourite. The full protocol is on our prevention page.
Test yourself: the food-handler illness rules
80 original questions in 7 groups — every one with the rule explained and the Food Code section cited. Start with the 15-question baseline, then drill what you miss. Your progress is saved in this browser.
Frequently Asked Questions
A food handler who is diagnosed with norovirus must be…?
Excluded from the establishment (§ 2-201.12(A)(2)); the PIC notifies the regulatory authority (§ 2-201.11(B)); reinstated only with regulatory approval plus more than 48 hours since symptoms resolved, or a practitioner's written statement that they are free of norovirus (§ 2-201.13(D)). If the diagnosed worker never had symptoms, they are restricted (excluded in an HSP establishment) and cleared 48 hours after diagnosis on the same approval.
Is it 24 hours or 48 hours?
Twenty-four hours asymptomatic reinstates a worker who had vomiting or diarrhea with no diagnosis. Forty-eight hours is the diagnosed-norovirus clock, and it comes with a regulatory-approval step; at 24 hours a diagnosed worker in an ordinary establishment only moves from excluded to restricted.
Does the worker need a doctor's note to come back?
For undiagnosed vomiting or diarrhea, no — 24 hours asymptomatic is sufficient, and a practitioner's note is only the alternative route (for a noninfectious cause). For the diagnosed Big 6 the note is one of the reinstatement routes, not a requirement; elapsed time (or stool cultures for the bacteria) is the other. Typhoid is the exception: documentation only.
What is the difference between exclude and restrict?
Excluded workers may not work in or enter the establishment as employees. Restricted workers may work but not with exposed food, clean equipment, utensils, linens or unwrapped single-use articles. Section 3 above lists which situation gets which, and which depend on the establishment serving a highly susceptible population.
Does this page cover the whole exam?
No — only the infection-control portion. Temperatures, HACCP, allergens, receiving and pest control are the bulk of the exam and are not covered here. This is not a course or a certificate.
Sources & References
- U.S. Food and Drug Administration. Food Code 2022 (full text, PDF). Chapter 1 § 1-201.10 (definitions of asymptomatic, conditional employee, exclude, health practitioner, highly susceptible population, person in charge, restrict); Chapter 2 §§ 2-101.11, 2-102.11–.12, 2-103.11, 2-201.11–.13, 2-301.11–.16, 2-302.11, 2-401.11–.13, 2-501.11; Chapter 3 § 3-301.11; Annex 3 public-health reasons for §§ 2-201 and 2-501.11. fda.gov/media/164194/download
- U.S. Food and Drug Administration. FDA Food Code 2022 — programme page describing the Code as a model for state and local adoption. fda.gov/food/fda-food-code/food-code-2022
- Centers for Disease Control and Prevention. Norovirus — Prevention. Handwashing with soap and water; hand sanitizer not a substitute; chlorine bleach 1,000–5,000 ppm for surface disinfection. cdc.gov/norovirus/prevention
- Centers for Disease Control and Prevention. Norovirus — Facts for Food Workers. cdc.gov/norovirus/communication-resources/facts-for-food-workers
- National Restaurant Association. ServSafe Food Handler Program Overview — "The assessment is a 40-question, non-proctored test … Students must achieve at least a 75% score". Accessed 2026-09-20. servsafe.com/ss/foodhandler/FHOverview.aspx
- Atmar RL, Opekun AR, Gilger MA, et al. Norwalk virus shedding after experimental human infection. Emerg Infect Dis. 2008;14(10):1553–1557 — the shedding data behind the diagnosed-case clock. DOI: 10.3201/eid1410.080117
Norovirus Food Safety
High-risk foods, safe handling, the 145°F rule, and the ill-handler rules in their food-safety context.
School & Daycare Rules
The 24-hour and 48-hour rules for children and staff, and the shedding data behind them.
Cleaning & Disinfection
CDC's bleach concentration, handwashing technique and the vomit-cleanup protocol.
How It Spreads
The shedding window, vomit aerosolisation and why sanitizer underperforms.
