A norovirus infection typically lasts 1 to 3 days for most healthy adults. Symptoms hit fast, peak within the first 24 hours, and then taper off. But the full picture is more nuanced than that number suggests, because you remain contagious well after you feel better, and the virus itself can survive on surfaces for weeks.
Incubation: 12 to 48 Hours Before Symptoms Start
After you’re exposed to norovirus, there’s a gap before anything happens. This incubation period ranges from 12 to 48 hours. During this window you feel completely fine, but the virus is already replicating in your gut. Most people notice the first signs right around the 24-hour mark, often describing the onset as sudden. You might go from feeling normal to vomiting within the span of an hour.
What the Active Illness Looks Like
Once symptoms begin, expect an intense but relatively short ride. The hallmark symptoms are nausea, vomiting, watery diarrhea, and stomach cramps. Many people also get a low-grade fever, headache, and body aches. Vomiting tends to dominate the first 12 to 24 hours, sometimes hitting in waves every 30 to 60 minutes during the worst stretch. Diarrhea often continues a bit longer than the vomiting does.
For most healthy adults and older children, the worst is over within 24 to 48 hours. By day 3, the vomiting and diarrhea have usually stopped entirely, though you may feel drained and have a reduced appetite for another day or two. That lingering fatigue is normal. Your body has lost fluids and electrolytes, and rebuilding those reserves takes a little time.
Who Gets Sicker for Longer
Young children, older adults, and people with weakened immune systems often experience a more prolonged course. In these groups, diarrhea can persist for 4 to 6 days, and the risk of dehydration is significantly higher. Infants and elderly adults lose fluids faster and may not be able to replace them by drinking, which is why norovirus sends more people in these age groups to the hospital than any other demographic.
Signs that dehydration is becoming serious include producing very little urine, having a dry mouth, feeling dizzy when standing, and (in infants) crying without tears. These are signals that oral rehydration alone may not be enough.
You’re Contagious Longer Than You Think
Here’s the part most people underestimate: you can still spread norovirus for 2 weeks or more after you feel better. The virus continues to shed in your stool long after vomiting and diarrhea have stopped. This means returning to work or school the day after your symptoms clear doesn’t mean you’re safe to be around others without careful hand hygiene.
The most contagious window is during active illness and the first 48 hours after symptoms resolve. That’s when viral shedding is at its peak. But because the virus remains in your system for weeks, thorough handwashing with soap and water (not just hand sanitizer, which doesn’t kill norovirus effectively) is essential during the entire post-illness period.
How Long the Virus Survives on Surfaces
Norovirus is remarkably durable outside the body. On hard surfaces like countertops, doorknobs, and plastic, the virus can remain infectious for more than two weeks. On soft surfaces like carpet, upholstery, or clothing, it stays viable for several days to a week. This persistence is a major reason norovirus spreads so efficiently through households, cruise ships, and schools. One person vomits in a bathroom, and if the surfaces aren’t properly disinfected, the next person who touches them can pick up the virus days later.
Cleaning up after a norovirus illness requires more than a quick wipe-down. Standard household cleaners won’t reliably kill it. A bleach solution of 5 to 25 tablespoons of household bleach per gallon of water, left on the surface for at least 5 minutes, is what the CDC recommends. You can also use an EPA-registered disinfectant specifically labeled as effective against norovirus. Wash contaminated laundry on the hottest setting available and dry on high heat.
Staying Hydrated During Recovery
There’s no antiviral medication for norovirus. Recovery is entirely about managing symptoms, and the single most important thing you can do is replace lost fluids. Small, frequent sips of water, broth, or an oral rehydration solution work better than trying to gulp large amounts at once, which can trigger more vomiting. For children, oral rehydration solutions are preferable to plain water because they replace both fluids and the electrolytes lost through diarrhea.
As the vomiting subsides, reintroduce bland foods gradually. Rice, toast, bananas, and plain crackers are gentle starting points. Avoid dairy, caffeine, alcohol, and fatty or heavily seasoned foods until your stomach has fully settled, which for most people takes 1 to 2 days after the last episode of vomiting or diarrhea. Your appetite will return on its own as your gut lining heals.
Timeline at a Glance
- Exposure to first symptoms: 12 to 48 hours
- Active vomiting and diarrhea: 1 to 3 days (longer in young children, elderly adults, and immunocompromised individuals)
- Post-illness fatigue and reduced appetite: 1 to 2 additional days
- Contagious period after feeling better: 2 weeks or more
- Virus survival on hard surfaces: over 2 weeks
- Virus survival on soft surfaces: a few days to 1 week