Norovirus symptoms typically last 1 to 3 days. Most people recover fully without treatment, though the illness can feel severe while it’s happening, with repeated bouts of vomiting and diarrhea throughout the day. The total timeline from exposure to full recovery, including the period before symptoms even start, usually spans about 4 to 5 days.
From Exposure to First Symptoms
After you’re exposed to norovirus, there’s a gap of 12 to 48 hours before you feel anything. During this incubation period, the virus is multiplying in your gut but hasn’t triggered a noticeable immune response yet. Most people develop symptoms around the 24-hour mark, though it can hit as early as half a day after contact or take a full two days to appear.
What the Acute Illness Looks Like
Once symptoms begin, expect 1 to 3 days of nausea, vomiting, diarrhea, and stomach cramps. Some people also develop a low-grade fever, headache, or body aches. The first 24 hours tend to be the worst. Vomiting often peaks early and may ease before diarrhea does.
You can lose a surprising amount of fluid in a short time. Adults may vomit or have diarrhea many times a day during the peak of illness. For most healthy adults, this is miserable but manageable. Young children, older adults, and people with weakened immune systems face a higher risk of dehydration because their bodies have less margin for fluid loss.
Staying Hydrated During Recovery
Replacing lost fluids and electrolytes is the single most important thing you can do while sick. If vomiting makes it hard to keep anything down, try sipping small amounts of clear liquids rather than drinking a full glass at once. Water, broth, sports drinks, and fruit juices all work for most adults. Saltine crackers can also help replace electrolytes.
For children, oral rehydration solutions like Pedialyte are a better choice than juice or sports drinks because they contain a precise balance of glucose and electrolytes designed for smaller bodies. Older adults and anyone with a weakened immune system should also use oral rehydration solutions rather than relying on water alone.
Signs that dehydration is becoming a problem include dark urine, dizziness when standing, a dry mouth, and in young children, crying with few or no tears. If you or your child can’t keep fluids down for more than a day, or if symptoms seem to be getting worse rather than plateauing, that warrants medical attention.
How Long You’re Contagious
This is where the timeline gets tricky. You’re most contagious while you have symptoms and for the first couple of days after they stop, but viral shedding in stool continues well beyond that. The CDC recommends that healthcare workers and food handlers stay home for a minimum of 48 hours after symptoms fully resolve. That same 48-hour guideline is a reasonable benchmark for anyone deciding when to return to work, school, or group settings.
Even after that 48-hour window, you’re still shedding virus at lower levels. Careful hand hygiene during this extended period matters, especially before preparing food or caring for young children.
How Long Norovirus Survives on Surfaces
The virus is remarkably tough outside the body. Norovirus can persist on hard, nonporous surfaces in a dried state at room temperature for up to 21 to 28 days. That’s nearly a month on a countertop, doorknob, or bathroom faucet if it isn’t properly cleaned.
Standard soap and water won’t reliably kill norovirus on surfaces. Chlorine bleach solutions are the most effective disinfectant. If someone in your household is sick, focus on cleaning bathrooms, shared surfaces, and any area that might have been contaminated by vomit or stool. Wash contaminated laundry on the hottest setting available and dry on high heat.
Can You Get Norovirus Again?
Yes. Infection gives you some degree of protection against the same strain, and research suggests this immunity can last several years. But norovirus comes in many different strains, and the virus mutates frequently, so having it once doesn’t protect you from a different version. Children commonly experience multiple infections before age eight as their immune systems encounter new strains. There’s no lasting, broad immunity the way there is with some other viruses, which is why norovirus remains the leading cause of foodborne illness outbreaks year after year.
Timeline at a Glance
- Incubation: 12 to 48 hours after exposure
- Active illness: 1 to 3 days
- Most contagious: while symptomatic through 48 hours after symptoms stop
- Safe to return to work or school: at least 48 hours symptom-free
- Virus survival on surfaces: up to 3 to 4 weeks