Norovirus illness typically lasts 1 to 3 days in most adults. Symptoms hit fast and hard, but the worst is usually over within 48 hours. That said, the virus sticks around in your body longer than you feel sick, which matters for the people around you.
From Exposure to First Symptoms
After you’re exposed to norovirus, symptoms usually appear within 12 to 48 hours. The virus is remarkably efficient at causing infection. As few as 18 viral particles can make you sick, which is why norovirus spreads so easily through households, cruise ships, and workplaces. A tiny amount of contamination on a doorknob or shared surface is more than enough.
What the Acute Phase Feels Like
The first 12 to 24 hours are usually the roughest. Vomiting and watery diarrhea come on suddenly, often accompanied by nausea, stomach cramps, and sometimes a low fever, headache, or body aches. The vomiting tends to taper off within a day or so, while diarrhea can linger a bit longer. Most people notice a clear turning point where they start feeling significantly better, even if they’re still drained.
The biggest risk during this phase is dehydration. You’re losing fluids from both ends, and keeping anything down can feel impossible at the peak. Small, frequent sips of water or an oral rehydration solution work better than trying to drink large amounts at once.
Recovery and Getting Back to Normal
Once the vomiting and diarrhea stop, expect to feel wiped out for another day or two. Your gut needs time to recover, and jumping straight back to your normal diet can trigger nausea again.
Start with small, bland foods: crackers, toast, bananas, rice, applesauce, plain chicken. Eat in small amounts throughout the day rather than full meals. If nausea comes back, pause and try again later. Avoid dairy, caffeine, alcohol, and fatty or heavily seasoned foods for a few days after your symptoms resolve. Your digestive system is still irritated, and these can set you back.
How Long You’re Contagious
This is where norovirus gets tricky. You feel better after a few days, but you continue shedding the virus in your stool well beyond that point. The CDC recommends staying home from work for a minimum of 48 hours after your last symptoms resolve. If you work in food preparation or handling, this 48-hour rule is even more strictly enforced, and local health regulations may require a longer absence.
Good hand hygiene matters during this window. Wash your hands thoroughly with soap and water after using the bathroom, and be aware that alcohol-based hand sanitizers are less effective against norovirus than they are against many other germs.
The Virus Lingers on Surfaces
Norovirus is unusually tough outside the body. It can survive on hard surfaces at room temperature for up to 21 to 28 days in dried form. On carpets, it can remain viable for up to 12 days even with regular vacuuming. This persistence is a major reason outbreaks keep cycling through households and shared spaces.
Standard household cleaners don’t reliably kill it. Bleach-based solutions are the most effective option. A chlorine bleach solution with at least 1,000 parts per million of free chlorine (roughly 5 tablespoons of regular household bleach per gallon of water) is what public health guidelines recommend. Clean any contaminated surface in two steps: first remove any visible material, then apply the bleach solution and let it sit for several minutes before wiping. Pay special attention to bathrooms, light switches, faucet handles, and any surface a sick person has touched.
Can You Get It Again?
Unfortunately, yes. Norovirus has multiple strains, and getting sick with one strain doesn’t protect you from the others. Whatever immunity you build from a single infection is narrow and temporary. This is why some people feel like they catch norovirus every winter, and why there’s no lasting natural immunity the way there is with certain other viruses.
The practical takeaway: even if you just recovered, keep up the handwashing and surface cleaning if someone else in your household is still sick. Your recent infection won’t necessarily shield you from a different strain circulating at the same time.