Norovirus Prevention: Handwashing, Disinfection, and Food Safety

1. Handwashing: The Most Important Step

The CDC identifies handwashing with soap and water as the single most effective way to prevent norovirus transmission. The physical scrubbing action removes viral particles from the skin.

Proper Technique

1. Wet hands with clean, running water (temperature does not affect efficacy)
2. Apply soap and lather by rubbing hands together — including the backs of hands, between fingers, and under nails
3. Scrub for at least 20 seconds (the duration is important — brief rinses are not effective)
4. Rinse thoroughly under clean, running water
5. Dry with a clean towel or air dry

Critical Handwashing Moments

• After using the toilet or changing diapers
• Before preparing or eating food
• After caring for someone who is ill
• After touching surfaces in public restrooms, healthcare facilities, or schools during outbreak season
• After handling potentially contaminated laundry (vomit or diarrhea on clothing)

2. Surface Disinfection

Per CDC guidance, household disinfectants must contain chlorine bleach to be effective against norovirus. Quaternary ammonium ("quat") disinfectants and alcohol wipes that do not contain bleach are not reliably effective.

CDC-Recommended Disinfection Protocol

• Use a bleach solution of 5–25 tablespoons of household bleach (5.25–8.25%) per gallon of water — equivalent to approximately 1,000–5,000 ppm chlorine
• Apply to hard, non-porous surfaces (countertops, toilet seats, door handles, faucet handles)
• Allow the solution to remain on the surface for at least 1 minute before wiping
• Wear disposable gloves and a mask when cleaning up vomit or diarrhea

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3. Food Safety

See the dedicated Norovirus Food Safety page for detailed guidance on safe food handling. Key prevention points include:

• Wash fruits and vegetables thoroughly, even those with inedible peels (the virus can transfer during cutting)
• Cook shellfish (oysters, clams, mussels) to an internal temperature of at least 145°F (63°C) — raw shellfish carry significant norovirus risk
• Do not prepare food for others while ill or within 2 days of recovering from norovirus illness
• Discard food that may have been contaminated by an ill person's vomit or stool

4. Isolation During Illness

Isolating ill individuals promptly is critical to preventing norovirus outbreaks, particularly in shared living environments:

• Stay home from work, school, and public settings for at least 48 hours after symptoms resolve
• Use a separate bathroom from other household members if possible
• Wear gloves when handling soiled laundry; wash in hot water and dry on high heat
• Do not share towels, utensils, or drinking glasses with household members
• Promptly clean and disinfect any surface contaminated with vomit or stool

5. Laundry Handling

Per CDC guidance for laundry contaminated with vomit or fecal matter during norovirus illness:

1. Wear disposable gloves to handle soiled items
2. Carefully remove and bag soiled items — avoid shaking contaminated laundry (aerosolizes virus)
3. Wash in hot water at the maximum available cycle length
4. Tumble dry on the highest heat setting
5. Wash hands immediately after handling contaminated laundry, even if gloves were worn

What Doesn't Work Against Norovirus

• Alcohol hand sanitizers under 70% concentration (insufficient against norovirus)
• Quaternary ammonium disinfectants alone (no bleach; not EPA-registered for norovirus)
• Vinegar-based cleaners (not effective against norovirus)
• Antibiotics (no effect on viral infections)
• Freezing food (norovirus survives freezing temperatures)
• Light cooking of shellfish (insufficient to inactivate all norovirus; thorough cooking required)

This content is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare provider for medical decisions.