Fighting norovirus means managing symptoms while your body clears the infection (there’s no antiviral medication that works against it) and aggressively preventing its spread to others. Norovirus is one of the most contagious pathogens you’ll encounter: as few as 10 to 100 viral particles can cause infection, and a single bout of vomiting can release billions of them into the air and onto surfaces. The good news is that most healthy adults recover within one to three days. The challenge is everything that happens around you during and after that window.
What Recovery Actually Looks Like
There is no cure for norovirus. No antibiotic touches it (it’s a virus, not bacteria), and no antiviral drug targets it effectively. Your immune system does the work, which typically takes 24 to 72 hours from the onset of symptoms. During that time, expect waves of nausea, vomiting, watery diarrhea, stomach cramps, and sometimes a low-grade fever. The vomiting usually tapers off within the first day, while diarrhea can linger a bit longer.
The real medical risk during a norovirus infection is dehydration. You’re losing fluid fast from both ends, and if you can’t keep liquids down, the situation can escalate quickly for young children, older adults, and people with chronic health conditions. The goal is to replace fluids and electrolytes steadily, not in large gulps that trigger more vomiting. Small, frequent sips of an oral rehydration solution work better than water alone, because plain water doesn’t replace the sodium and potassium you’re losing. The CDC recommends about 3 liters of oral rehydration solution per day for adults with vomiting or diarrhea, about 1 liter per day for children, and roughly half a liter per day for babies and toddlers. Pre-made rehydration solutions are available at most pharmacies.
Signs that dehydration is becoming dangerous include producing very little urine, dry mouth, dizziness when standing, and in children, crying without tears or unusual sleepiness. These warrant medical attention promptly.
Why Hand Sanitizer Isn’t Enough
Norovirus is a non-enveloped virus, which means it lacks the fatty outer coating that alcohol-based hand sanitizers are designed to destroy. The CDC is clear on this point: hand sanitizer does not work well against norovirus. You can use it as a supplement, but soap and water is the only reliable method for removing the virus from your hands. Wash thoroughly for at least 20 seconds, especially after using the bathroom, changing diapers, and before preparing food.
This matters most during and after illness. You continue shedding norovirus in your stool for several weeks after you feel better. If you have an underlying health condition, shedding can persist for months. That means your hand hygiene needs to stay rigorous well beyond the point where symptoms resolve.
Cleaning Surfaces the Right Way
Norovirus is remarkably durable outside the body. It can survive on hard surfaces in a dried state for 21 to 28 days at room temperature. It persists in carpets for up to 12 days even with regular vacuuming. It’s been detected on keyboards, computer mice, and phones up to 72 hours after contamination. Standard household cleaners won’t reliably kill it.
Chlorine bleach is the most accessible and effective disinfectant. A solution of about 5 tablespoons (one-third cup) of household bleach per gallon of water is a commonly recommended concentration for hard, nonporous surfaces. The critical detail most people skip is contact time: the surface needs to stay visibly wet with the solution for the duration listed on the product label, which varies by concentration. Simply spraying and wiping won’t do it. For commercially available disinfectants, look for products on the EPA’s List G, which are specifically registered as effective against norovirus. The product label will include directions for norovirus disinfection, including the required contact time.
For soft surfaces like carpets or upholstered furniture, steam cleaning at high temperatures is more effective than chemical sprays. Any laundry contaminated with vomit or stool should be washed on the hottest available setting and machine-dried.
Containing the Spread at Home
Given how few viral particles it takes to start an infection, containment is everything when someone in your household is sick. The person who is ill should ideally use a dedicated bathroom. If that’s not possible, the bathroom should be disinfected with a bleach solution after every use. The sick person should not prepare food for others, not just during symptoms but for at least two days after recovery, and ideally longer given the extended shedding period.
After a vomiting episode, clean the area immediately. Norovirus becomes airborne in tiny droplets during vomiting and can settle on surfaces several feet away. Wear disposable gloves, clean up solid material with paper towels, then disinfect the entire surrounding area. Dispose of gloves and cleaning materials in a sealed plastic bag, and wash your hands with soap and water afterward.
Food Safety and Norovirus
Norovirus is the leading cause of foodborne illness, and it spreads through food in two main ways: an infected person handles food with contaminated hands, or the food itself (especially shellfish) is harvested from contaminated water. Oysters are a particular risk because they filter large volumes of water and can concentrate the virus in their tissues.
Cooking does kill norovirus, but it requires more heat than many people expect. Research on oysters found that the optimal treatment was 10 minutes at 85°C (185°F) or 5 minutes at 100°C (212°F), measured from when the internal temperature reaches those thresholds. A quick sear or light steam isn’t sufficient. For oysters specifically, thorough cooking to a full boil for at least several minutes is the safest approach. Fruits and vegetables should be washed well under running water before eating, and any produce that may have been handled by someone who was ill should be discarded.
How Long You’re Contagious
The contagious window for norovirus is wider than most people realize. You’re most contagious while symptomatic and for the first few days after symptoms stop, but viral shedding in stool continues for weeks. In people with weakened immune systems or chronic illness, shedding can last months. This doesn’t mean you need to quarantine for weeks, but it does mean that hand hygiene after using the bathroom remains critical for a long time after you feel fine.
Children in daycare and food service workers face the strictest guidelines: most health departments recommend staying home for at least 48 hours after the last episode of vomiting or diarrhea. Even after returning to normal activities, the virus is still present in your stool, so consistent handwashing is the single most important thing you can do to protect the people around you.