Norovirus is the leading cause of acute gastroenteritis worldwide, responsible for an estimated 685 million cases and approximately 200,000 deaths each year, disproportionately affecting young children and older adults in low-income countries. In the United States alone, the CDC estimates norovirus causes 19–21 million illnesses, 109,000 hospitalizations, and 900 deaths annually. For nurses, norovirus is not merely a gastrointestinal inconvenience — in vulnerable populations (elderly nursing home residents, immunocompromised patients, infants) it can cause severe dehydration, electrolyte imbalances, and death. In healthcare settings, norovirus outbreaks can force unit closures, cohorting of patients, and suspension of admissions.
This reference covers pathophysiology, clinical presentation, nursing assessment, fluid and electrolyte management, infection control priorities (including the critical difference between norovirus and bacteria like C. diff when it comes to hand hygiene and disinfectants), patient education, and six NCLEX-style practice questions.
Fast-scan summary
| Parameter | Key facts |
|---|---|
| Organism | Norovirus — small, non-enveloped, single-stranded RNA virus; Caliciviridae family; multiple genogroups (GI, GII, GIV cause human disease; GII.4 predominates) |
| Transmission | Fecal-oral (primary); aerosolized vomitus (droplet); contaminated food/water; fomites; low infectious dose (~18 viral particles) |
| Incubation | 12–48 hours after exposure |
| Classic presentation | Sudden-onset nausea, projectile vomiting, watery non-bloody diarrhea, crampy abdominal pain, low-grade fever; self-limiting 1–3 days in healthy adults |
| Vulnerable populations | Elderly (nursing home residents), infants, immunocompromised patients — higher risk of severe dehydration and complications |
| Treatment | Supportive: oral rehydration therapy (ORT); IV fluids if severe or unable to tolerate orals; no antivirals approved |
| Isolation precautions | Contact precautions (gown + gloves) at minimum; add droplet precautions during active vomiting episodes |
| CRITICAL hand hygiene rule | Soap and water REQUIRED — alcohol-based hand rub (ABHR) is NOT effective against non-enveloped norovirus |
| Environmental decontamination | Chlorine bleach solution (1,000–5,000 ppm hypochlorite); standard quaternary ammonium cleaners have limited efficacy |
| Outbreak threshold | ≥2 linked cases in 48h with no other cause identified — escalate to infection control immediately |
Pathophysiology
Viral structure and why it matters for infection control
Norovirus is a non-enveloped RNA virus. This structural feature is clinically critical: without a lipid envelope, norovirus is resistant to alcohol-based hand rubs, which work primarily by disrupting viral lipid envelopes. This places norovirus alongside C. difficile (though for different reasons — C. diff is resistant due to its spore form) as requiring mandatory soap-and-water hand hygiene for decontamination.
Norovirus also has an extraordinarily low infectious dose. As few as 18 viral particles can establish infection, and an infected person sheds billions of particles per gram of stool. This combination — low infectious dose, high shedding volume, environmental stability (survives on surfaces for days to weeks), resistance to routine alcohol disinfection — explains why norovirus spreads with exceptional efficiency in congregate settings.
Mechanism of disease
After ingestion, norovirus infects the epithelial cells lining the small intestine. The virus does not invade the mucosa or cause ulceration; instead, it disrupts the structure and function of intestinal villi. Infection causes:
- Villous blunting — reduction in absorptive surface area, impairing nutrient and fluid absorption
- Impaired sodium-glucose cotransport — reducing the efficiency of the primary intestinal water absorption mechanism
- Accelerated gut transit — liquid content passes through the colon before adequate water absorption occurs, producing watery diarrhea
- Delayed gastric emptying — contributes to nausea and vomiting
The combination of impaired absorption and increased secretion produces net fluid loss into the bowel lumen. In healthy adults, compensatory mechanisms limit the severity; in infants, elderly patients, and those with underlying illness, fluid and electrolyte losses can rapidly become clinically significant.
The immune response typically clears the virus within 1–3 days in immunocompetent individuals. Notably, immunity is short-lived (months to a few years at most) and strain-specific — people can be reinfected with different norovirus genogroups, explaining why norovirus remains a recurring problem throughout a person’s lifetime.
Why fluid and electrolyte loss is the central nursing concern
The predominant pathological consequence of norovirus infection is isotonic dehydration with concurrent losses of sodium, potassium, chloride, and bicarbonate through diarrhea and emesis. In elderly patients, the physiological reserve for fluid shifts is reduced, baseline kidney function may be impaired, and thirst sensation is blunted — all of which accelerate the transition from mild to moderate-to-severe dehydration. Review the site’s electrolyte imbalances reference for a full breakdown of the expected lab abnormalities in dehydration states.
Clinical presentation
Signs and symptoms
| System | Symptoms | Signs (objective) |
|---|---|---|
| GI | Sudden-onset nausea; projectile vomiting (1–12+ episodes/day); watery, non-bloody diarrhea (4–8+ episodes/day); crampy, diffuse abdominal pain | Hyperactive or hypoactive bowel sounds; abdominal tenderness (diffuse, mild); distension (uncommon) |
| Constitutional | Malaise, fatigue, myalgia, headache | Low-grade fever (37.5–38.5°C / 99.5–101.3°F); occasionally afebrile |
| Fluid status | Thirst (may be absent in elderly); dizziness, lightheadedness (orthostatic) | Dry mucous membranes; decreased skin turgor; sunken eyes; orthostatic hypotension; tachycardia; decreased urine output; concentrated urine |
| Neurological (severe/elderly) | Confusion, lethargy | Altered mental status (may be first sign of dehydration in elderly); weakness |
Dehydration severity classification
| Severity | Estimated fluid deficit | Clinical features | Nursing priority |
|---|---|---|---|
| Mild | <3% body weight | Thirsty; slightly dry mouth; normal vitals; normal urine output | Encourage oral rehydration; monitor intake/output |
| Moderate | 3–9% body weight | Dry mucous membranes; tachycardia; decreased urine output; orthostatic changes; irritability or restlessness | Aggressive ORT; reassess frequently; IV access; consider IV fluids if not tolerating orals |
| Severe | >9% body weight | Markedly decreased urine output or anuria; sunken eyes/fontanelle (infants); tachycardia + hypotension; altered mental status; mottled skin | IV fluid resuscitation; continuous monitoring; electrolyte replacement; may require ICU-level care in elderly/immunocompromised |
Assessment and diagnosis
Nursing assessment priorities
The first nursing priority is fluid status assessment. In norovirus, the question is not whether the patient has gastroenteritis — clinically obvious — but whether they are progressing to clinically significant dehydration that requires escalation. A thorough assessment includes:
Vital signs — Tachycardia is often the earliest objective sign of dehydration. Orthostatic hypotension (systolic BP drop ≥20 mmHg or HR increase ≥20 bpm on standing) indicates moderate-to-severe volume depletion. Hypotension at rest signals hemodynamic compromise. Review the vital signs by age reference for age-specific baseline ranges when assessing pediatric or geriatric patients.
Intake and output — Accurate I&O is essential. Urine output less than 0.5 mL/kg/hour indicates inadequate renal perfusion. Weigh the patient daily (same time, same scale) — each kilogram of weight lost acutely represents approximately 1 liter of fluid deficit.
Mucous membranes and skin turgor — Dry lips and oral mucosa, loss of normal skin turgor (tenting), and sunken eyes are objective hydration markers. In elderly patients, reduced skin elasticity makes skin turgor a less reliable indicator — rely more heavily on vital signs and urine output.
Mental status — In elderly patients, confusion or increased lethargy can be the presenting sign of dehydration rather than a late finding. Any acute change in mental status should prompt urgent reassessment of fluid balance.
Stool characteristics — Document frequency, volume (estimate), consistency, color, and presence of blood or mucus. Bloody diarrhea is NOT typical of norovirus and should raise suspicion for bacterial gastroenteritis (Salmonella, Shigella, Campylobacter, E. coli O157:H7), ischemic colitis, or inflammatory bowel disease flare — escalate to the provider.
Abdominal assessment — Diffuse mild tenderness is expected. Rebound tenderness, involuntary guarding, rigidity, or absent bowel sounds should prompt immediate provider notification to rule out surgical causes (appendicitis, bowel obstruction, peritonitis). See the site’s peritonitis nursing reference for escalation criteria.
Diagnostic workup
Norovirus gastroenteritis is typically a clinical diagnosis based on history and presentation. The characteristic epidemiological pattern — sudden onset, vomiting predominant, multiple cases in a congregate setting within 48 hours of exposure — is highly specific.
Laboratory testing — Not routinely indicated for mild disease in healthy adults. Ordered when:
- Severe dehydration, signs of systemic illness, or immunocompromised status
- Prolonged illness (>72 hours) or failure to improve
- Bloody diarrhea (to rule out bacterial pathogens)
- Outbreak investigation (stool PCR or RT-PCR for norovirus confirmation)
Key lab findings in dehydration
| Lab test | Expected finding in dehydration | Clinical significance |
|---|---|---|
| BMP/CMP — Sodium (Na+) | Variable; often normal (isotonic dehydration); may be hyponatremic if free water replaced without electrolytes, or hypernatremic if insensible losses exceed intake | Guides fluid selection (NS vs. hypotonic) |
| Potassium (K+) | May be low (hypokalemia) from diarrhea and vomiting losses | Risk for cardiac dysrhythmias; requires replacement |
| Bicarbonate (HCO3−) | May be low — metabolic acidosis from bicarbonate loss in diarrhea | Consistent with non-anion gap metabolic acidosis; see ABG interpretation for context |
| BUN / Creatinine | Elevated BUN; elevated creatinine; BUN:Cr ratio >20:1 (pre-renal pattern) | Indicates pre-renal azotemia from volume depletion; monitor for AKI progression |
| Urine specific gravity | Elevated (>1.030) | Concentrated urine = kidneys conserving water; confirms dehydration |
| CBC — Hematocrit / WBC | Hemoconcentration (elevated Hct/Hgb); WBC may be mildly elevated with stress response; marked leukocytosis suggests bacterial superinfection | Monitor for hemoconcentration trend |
| Glucose | Typically normal; may be low in infants (risk of hypoglycemia) | Monitor closely in infants and diabetic patients |
See the nursing lab values cheat sheet for normal reference ranges and full interpretation guidance.
Nursing interventions
Prioritized interventions with rationale
| Priority | Intervention | Rationale |
|---|---|---|
| 1 | Implement contact precautions immediately upon suspicion; add droplet precautions during active vomiting; place patient in private room if available | Norovirus spreads via fecal-oral route AND aerosolized vomitus; early containment prevents unit-wide outbreak |
| 2 | Conduct rapid dehydration assessment: vital signs (including orthostatics), I&O, mental status, mucous membranes, urine output, daily weight | Identifies patients at risk for severe dehydration requiring IV fluid intervention and prevents deterioration to hemodynamic compromise |
| 3 | Initiate oral rehydration therapy (ORT) if patient is alert and tolerating orals: offer small, frequent sips of oral rehydration solution (ORS); avoid plain water or sugary drinks as sole fluid replacement | ORS exploits intact sodium-glucose cotransport mechanism to promote intestinal water absorption even when general absorptive capacity is reduced; superior to IV fluids for mild-moderate dehydration in patients who can tolerate orals |
| 4 | Establish IV access; administer IV fluid resuscitation (isotonic crystalloid — NS or LR) per order for: inability to tolerate ORT, moderate-to-severe dehydration, altered mental status, hemodynamic instability | Restores intravascular volume; LR more closely matches physiological electrolyte composition; NS preferred if hyponatremia present |
| 5 | Monitor and replace electrolytes per order, particularly potassium (K+) and bicarbonate; recheck BMP after rehydration | Vomiting and diarrhea cause K+ and HCO3− losses; hypokalemia risks cardiac dysrhythmias; acidosis impairs cellular function |
| 6 | Perform meticulous skin assessment: inspect perianal area and skin folds at each care encounter; apply moisture barrier cream prophylactically | Frequent liquid stools cause chemical irritation and skin breakdown within hours; prevention of [pressure injuries and wound complications](/nursing-tips/wound-assessment/) is far easier than treatment |
| 7 | Provide anti-emetic and anti-motility medications per order (e.g., ondansetron for nausea); assess response; do NOT administer anti-motility agents if bloody diarrhea or suspected bacterial infection | Reduces vomiting to improve ORT tolerance; anti-motility agents (loperamide) are contraindicated in suspected bacterial enteritis due to risk of prolonging illness; safe for confirmed viral gastroenteritis in adults |
| 8 | Enforce soap-and-water hand hygiene for all staff and visitors after any contact with patient or environment; do not rely on ABHR | Norovirus is non-enveloped and alcohol-resistant; soap and water physically removes viral particles; ABHR does not inactivate norovirus at standard concentrations |
| 9 | Advance diet as tolerated once vomiting controlled: begin with clear liquids → full liquids → bland solids (BRAT diet as guide); avoid high-fat, high-fiber, or dairy foods initially | Early reintroduction of food supports intestinal epithelial recovery and restores normal gut flora; fasting is not recommended beyond the acute vomiting phase |
| 10 | Monitor for complications: signs of sepsis, AKI (rising creatinine, oliguria/anuria), altered mental status, bloody diarrhea, worsening symptoms after 72h | Severe dehydration can precipitate [acute kidney injury](/nursing-tips/aki-nursing/) or [septic shock](/nursing-tips/sepsis-nursing/) in vulnerable patients; clinical deterioration requires immediate provider escalation |
Fluid and electrolyte management
Oral rehydration therapy
Oral rehydration therapy (ORT) is the preferred first-line treatment for mild-to-moderate dehydration from viral gastroenteritis in patients who are alert and can swallow safely. ORT exploits the sodium-glucose cotransport mechanism in small intestinal enterocytes, which remains partially functional even when general absorptive capacity is impaired by norovirus infection. Glucose in the ORS facilitates sodium absorption, which draws water along osmotically.
The WHO/UNICEF standard ORS formulation contains: sodium 75 mEq/L, chloride 65 mEq/L, glucose (anhydrous) 75 mmol/L, potassium 20 mEq/L, citrate 10 mEq/L — providing approximately 245 mOsm/L. Commercial preparations (Pedialyte, Ceralyte, Hydralyte) approximate this composition.
ORT nursing guidance:
- Offer small volumes (5–10 mL) every 1–5 minutes if patient has active vomiting; increase volume as tolerated
- Avoid plain water alone (lacks electrolytes; risks hyponatremia if used exclusively in prolonged illness)
- Avoid sports drinks (Gatorade, Powerade) as primary rehydration — high glucose, low sodium; may worsen osmotic diarrhea
- Avoid carbonated beverages, caffeinated drinks, and full-strength juice — worsen symptoms
- Target approximately 50–100 mL/kg over 3–4 hours for mild-moderate dehydration in adults; ongoing losses require additional replacement (roughly 10 mL/kg per loose stool or vomiting episode)
IV fluid management
IV fluids are indicated when the patient cannot tolerate oral intake, has moderate-to-severe dehydration, is hemodynamically unstable, or has altered mental status.
Fluid selection:
- Isotonic crystalloid (0.9% Normal Saline or Lactated Ringer’s) for initial resuscitation
- LR is slightly more physiologically balanced and may reduce hyperchloremic metabolic acidosis compared to large volumes of NS
- Hypotonic fluids (0.45% NS) are used for maintenance once volume restored, particularly in children
Electrolyte replacement:
- Potassium: replace per protocol; do not exceed 10–20 mEq/hour peripherally; ensure adequate urine output before administering IV potassium
- Bicarbonate replacement: generally reserved for severe metabolic acidosis (pH <7.1) or clinically significant acidosis per provider order
- Monitor BMP every 4–6 hours during active fluid resuscitation; reassess fluid responsiveness by tracking heart rate, blood pressure, urine output, and mental status trends
Refer to the electrolyte imbalances nursing reference for specific electrolyte replacement protocols and monitoring parameters.
Infection control
Why norovirus demands exceptional vigilance
Norovirus is among the most contagious infectious agents encountered in healthcare settings. The combination of extremely low infectious dose, massive viral shedding, prolonged environmental survival, resistance to alcohol-based disinfectants, and aerosol generation during vomiting creates conditions for rapid, difficult-to-contain outbreaks. Healthcare settings — particularly long-term care facilities, hospitals, cruise ships, schools, and military facilities — are high-risk environments.
Precaution levels
| Scenario | Precaution level | Required PPE | Notes |
|---|---|---|---|
| Patient with gastroenteritis symptoms (confirmed or suspected norovirus) | Contact precautions | Gown + gloves for all patient contact and room entry | Private room preferred; if unavailable, cohort symptomatic patients |
| During active vomiting episode | Contact + droplet precautions | Gown + gloves + surgical mask (minimum); consider face shield/eye protection | Aerosolized vomitus carries high viral load; brief exposure risk is significant |
| Cleaning contaminated vomit/stool | Enhanced contact | Gown + gloves + mask + eye protection | Use chlorine bleach solution; absorb liquid before wiping to reduce aerosolization |
| Outbreak management (multiple linked cases) | Unit-level containment | All staff: full PPE per contact precautions when entering unit | Suspend new admissions to affected unit; cohort infected staff away from patient care |
Hand hygiene — the most critical intervention
Soap and water is mandatory after caring for norovirus patients or handling contaminated materials. Alcohol-based hand rub (ABHR) does not inactivate norovirus because the virus lacks a lipid envelope. This is the most frequently tested NCLEX infection control point for norovirus and is directly analogous to the soap-and-water requirement for C. diff (though C. diff requires soap and water due to spore resistance rather than non-enveloped structure).
Proper soap-and-water technique: wet hands, apply soap, lather for minimum 20 seconds covering all surfaces, rinse under running water, dry with disposable towel, use towel to turn off faucet.
Environmental decontamination
Standard quaternary ammonium compounds (quats) — the most common hospital-grade disinfectants — have limited or unreliable efficacy against norovirus. Effective environmental decontamination requires:
- Chlorine bleach solution: 1,000 ppm (0.1%) for general surface disinfection; 5,000 ppm (0.5%) for visibly soiled areas or outbreak conditions
- 1,000 ppm solution: approximately 5 tablespoons (75 mL) of 6% household bleach per gallon of water, or 2 tablespoons per quart
- Contact time: minimum 1–2 minutes; longer contact times improve efficacy
- EPA-registered products with specific norovirus claims on the label (check the EPA List G for human norovirus)
- Vomit spills: absorb immediately with paper towels; discard in sealed plastic bag; decontaminate area with bleach solution; vomit can contain 10⁷–10⁸ viral particles per mL
- High-touch surfaces: door handles, call buttons, light switches, bed rails, bathroom fixtures — clean and disinfect at minimum twice daily and after any contamination event
- Linens: handle with minimal agitation to avoid aerosolization; bag in room; launder with hot water and dry on high heat
Outbreak management in healthcare settings
Norovirus outbreaks in healthcare facilities require immediate, coordinated infection control response. The CDC and CDC/SHEA guidelines define a potential outbreak as two or more linked cases of acute gastroenteritis with onset within 48 hours in a healthcare setting with no other identified cause.
Nursing responsibilities in outbreak management:
- Report immediately to charge nurse and infection control/epidemiology team — do not wait for laboratory confirmation
- Cohort patients — separate symptomatic patients from asymptomatic; do not move patients between rooms or units unnecessarily
- Restrict admissions to affected unit until outbreak is controlled (typically ≥72 hours after last new case with enhanced cleaning complete)
- Exclude symptomatic staff from patient care — healthcare workers are both victims and vectors; staff who develop symptoms must be excluded until 48–72 hours after symptom resolution (norovirus shedding continues after clinical recovery)
- Enhance environmental cleaning — increase frequency of high-touch surface decontamination with bleach-based products
- Food service controls — infected food handlers must be excluded; investigate food sources if outbreak onset pattern suggests point-source food-borne transmission
- Visitor restrictions — symptomatic visitors should not enter clinical areas; general visitor restriction may be implemented during active outbreak
Patient and family education
Effective patient education for norovirus focuses on four areas: preventing spread to household contacts, managing symptoms at home, knowing when to seek further medical care, and safe return to work or school.
Hand hygiene — Reinforce that soap and water (not hand sanitizer) is required after using the bathroom, before preparing food, and before eating. The patient should wash hands for at least 20 seconds. All household members should follow the same protocol until the symptomatic person has been symptom-free for at least 48 hours.
Fluid replacement at home — Instruct patient to sip oral rehydration solution frequently. If vomiting, start with very small amounts (1 teaspoon every few minutes) and increase gradually. Popsicles and ice chips count toward fluid intake. Avoid alcohol and caffeine. Children and elderly patients are at highest risk of rapid dehydration — monitor closely.
Dietary progression — Begin with clear liquids (ORS, broth, clear juice), advance to bland solids (crackers, toast, rice, bananas) as tolerated, then return to regular diet over 1–2 days. Avoid dairy, fatty foods, and high-fiber foods for 24–48 hours after symptoms resolve.
When to seek emergency care:
- Signs of severe dehydration: no urination for 8+ hours (adults) / 6+ hours (children), sunken eyes, rapid heartbeat, dizziness on standing, confusion or extreme weakness
- Bloody diarrhea (not normal for norovirus)
- High fever (>39°C / 102.2°F)
- Symptoms not improving after 3 days
- Infants: fewer than 6 wet diapers/day, no tears when crying, sunken fontanelle
Return to work/school — Stay home until at least 48 hours after symptoms resolve. This is especially important for food handlers, healthcare workers, and people in childcare settings. Viral shedding can continue for 2 weeks or longer after clinical recovery, so strict hygiene should be maintained throughout this period.
NCLEX-style practice questions
| # | Question | Answer & rationale |
|---|---|---|
| 1 | A nurse is caring for four patients on a medical-surgical unit. Two patients in adjacent rooms develop sudden-onset vomiting and watery diarrhea within 6 hours of each other. The charge nurse suspects a norovirus outbreak. Which is the nurse's PRIORITY action? A. Obtain stool cultures on both patients immediately B. Administer loperamide (Imodium) to reduce diarrhea C. Implement contact precautions and notify the infection control team D. Transfer both patients to a negative pressure isolation room |
Answer: C Implementing contact precautions and notifying infection control is the priority to prevent spread and initiate outbreak management protocols. Stool cultures (A) are appropriate for the outbreak investigation but are not the immediate priority. Loperamide (B) is generally avoided until bacterial causes are ruled out. Negative pressure rooms (D) are for airborne precautions (TB, varicella) — norovirus requires contact precautions, with droplet added during active vomiting only. |
| 2 | A nurse exits the room of a patient with confirmed norovirus gastroenteritis after removing PPE. Which hand hygiene action is most appropriate? A. Use alcohol-based hand rub — it is sufficient for all healthcare-associated pathogens B. Wash hands with soap and water for at least 20 seconds C. Apply alcohol-based hand rub followed by a hand sanitizer with ≥70% alcohol D. Use soap and water only if hands are visibly soiled |
Answer: B Norovirus is a non-enveloped virus and is not inactivated by alcohol-based hand rub (ABHR). Soap and water is required — it physically removes viral particles from skin surfaces. Options A and C are incorrect because ABHR at any concentration has insufficient efficacy against non-enveloped norovirus. Option D is incorrect because the soap-and-water requirement applies regardless of visible soiling for norovirus. |
| 3 | An 82-year-old nursing home resident with norovirus is found to be confused and difficult to arouse. Vital signs: BP 88/52 mmHg, HR 118 bpm, RR 20/min, SpO2 97%. Which assessment finding is most consistent with the clinical picture and requires the most urgent nursing action? A. SpO2 of 97% indicating mild hypoxemia B. RR of 20 indicating tachypnea C. Hypotension and tachycardia indicating severe dehydration with hemodynamic compromise D. Confusion indicating a new neurological event requiring CT scan |
Answer: C The BP of 88/52 and HR 118 in the context of norovirus illness are consistent with severe dehydration causing hemodynamic compromise — a medical emergency requiring immediate IV fluid resuscitation. Confusion in this patient is most likely secondary to severe dehydration and hypoperfusion, not a primary neurological event (D). SpO2 of 97% (A) is near normal and not the most urgent finding. RR 20 (B) is mildly elevated but not the priority in this picture. |
| 4 | A nurse is preparing to clean a hospital room after a patient with norovirus was discharged. Which cleaning agent is most effective for environmental decontamination? A. Standard quaternary ammonium compound (quat) disinfectant B. 70% isopropyl alcohol wipes C. Chlorine bleach solution at 1,000–5,000 ppm D. Soap and water followed by hydrogen peroxide spray |
Answer: C Norovirus requires chlorine bleach solution at 1,000–5,000 ppm for effective environmental decontamination. Quaternary ammonium compounds (A) have limited efficacy against norovirus and should not be relied upon for norovirus-contaminated environments. Alcohol wipes (B) are ineffective against non-enveloped norovirus. Hydrogen peroxide (D) has some efficacy but is not the standard of care; the EPA-approved approach is bleach-based for norovirus specifically. |
| 5 | A nurse is teaching a patient with mild norovirus gastroenteritis about fluid management at home. Which statement by the patient indicates a need for further teaching? A. "I should sip a small amount of oral rehydration solution every few minutes." B. "Sports drinks like Gatorade are a good substitute for oral rehydration solution." C. "I should call my doctor if I go more than 8 hours without urinating." D. "I should stay home for at least 48 hours after my symptoms are completely gone." |
Answer: B Sports drinks are not appropriate substitutes for oral rehydration solution. They are high in glucose and low in sodium — the opposite of what is needed for effective intestinal fluid absorption. High glucose content can actually worsen osmotic diarrhea. ORS (oral rehydration solution such as Pedialyte) is specifically formulated to match the sodium-glucose ratio needed for cotransport-mediated water absorption. Options A, C, and D reflect correct understanding of norovirus management. |
| 6 | A nurse is assigned to care for a patient with norovirus gastroenteritis who is on contact precautions. The patient suddenly begins actively vomiting. Which additional precaution should the nurse implement? A. Airborne precautions — move patient to a negative pressure room B. Droplet precautions — add a surgical mask to gown and gloves C. Protective (reverse) isolation — all staff must wear N95 respirators D. No additional precautions are needed beyond existing contact precautions |
Answer: B During active vomiting, norovirus can be aerosolized into droplets that can be inhaled or land on mucous membranes. Adding droplet precautions (surgical mask, at minimum) provides protection against exposure from vomitus aerosols. Airborne precautions with negative pressure rooms (A) are for pathogens that remain suspended in the air for long distances (TB, measles, varicella) — norovirus transmission during vomiting is droplet-range, not true airborne. Option C (protective isolation) is used for immunocompromised patients to protect them from the environment, not to contain infection. Option D is insufficient during active vomiting. |
Summary
Norovirus is a highly contagious, non-enveloped RNA virus that causes self-limiting acute gastroenteritis in healthy adults but can produce life-threatening dehydration in elderly patients, infants, and immunocompromised individuals. The central nursing priorities are: early and accurate dehydration assessment, prompt initiation of oral or IV rehydration therapy, and aggressive infection control to prevent spread. Two points differentiate norovirus infection control from routine practice: soap and water is required for hand hygiene (alcohol-based hand rub is ineffective against non-enveloped viruses), and environmental decontamination requires chlorine bleach at 1,000–5,000 ppm rather than standard quaternary ammonium cleaners. In healthcare settings, norovirus demands immediate outbreak response — cohorting, unit restrictions, staff exclusion, and enhanced cleaning — to protect vulnerable patients from a pathogen that spreads with exceptional efficiency.