Norovirus diarrhea typically lasts 1 to 3 days in otherwise healthy people. Most adults and children recover fully within that window, though some groups can experience symptoms for much longer. The illness comes on fast, hits hard, and clears relatively quickly, but the recovery timeline depends heavily on age and immune status.
The Typical Timeline
Symptoms start 12 to 48 hours after you’re exposed to the virus. Diarrhea, vomiting, and stomach pain tend to arrive together and peak within the first day. For the average healthy adult or child, the worst is over within 2 to 3 days. The vomiting often stops before the diarrhea does, so you may feel like you’re getting better while still dealing with loose stools for another day or so.
Even after the diarrhea stops, your gut isn’t immediately back to normal. The virus causes physical changes inside the small intestine: the tiny finger-like projections that absorb nutrients (called villi) become flattened and blunted. This impairs your ability to absorb fats and other nutrients properly. It’s one reason you may feel off, bloated, or have slightly irregular digestion for several days after the acute illness passes.
Why It Lasts Longer in Some People
Older adults, young children, and people with weakened immune systems face a different timeline entirely. In adults over 65, norovirus diarrhea commonly lasts 3 to 9 days. People 85 and older recover even more slowly, with nearly half still symptomatic after 4 days. Older adults hospitalized with norovirus are also more frequently admitted to intensive care, and an estimated 90% of norovirus-associated deaths in the U.S. occur in people 65 and older.
For immunocompromised individuals, the picture is more serious. People who’ve received organ transplants or are on immunosuppressive therapy can experience symptoms lasting weeks to months. In stem cell transplant recipients, symptom duration has ranged from 6 days to well over a year. Kidney transplant patients with norovirus tend to have especially severe courses, including significant weight loss and symptom durations nearly nine times longer than those caused by bacterial infections.
Dehydration Is the Main Risk
The diarrhea itself isn’t usually dangerous. What makes norovirus risky is the fluid loss, especially when vomiting and diarrhea happen simultaneously and make it hard to keep anything down. Children and older adults are the most vulnerable to dehydration because they have less fluid reserve and may not recognize or communicate thirst effectively.
In children, you can gauge dehydration by watching for a few specific signs: sunken-looking eyes, dry or sticky mouth and lips, reduced or absent tears when crying, and unusual drowsiness or irritability. A child who looks thirsty and restless but otherwise alert is likely mildly dehydrated. One who appears drowsy, limp, cold, or sweaty with very sunken eyes and no tears is in more serious territory and needs medical attention. Poor circulation in the hands and feet (cold, pale, slow to turn pink when pressed) is a red flag at any age.
For most people, steady sips of water, broth, or oral rehydration solutions are enough to get through it. Small, frequent amounts work better than large gulps, especially if you’re still vomiting.
How Long You Stay Contagious
Here’s the tricky part: you remain contagious well after you feel better. The virus continues to shed in your stool for days, sometimes weeks, after symptoms resolve. This is why the CDC recommends that food handlers and healthcare workers stay off duty for a minimum of 48 hours after their last symptom. Some local health departments require even longer exclusion periods.
That 48-hour rule is a good guideline for anyone, not just workers in sensitive settings. If you return to a shared environment (office, school, daycare) while you’re still shedding the virus, you can easily pass it along. Norovirus is extraordinarily contagious. It takes a very small number of viral particles to infect someone new.
Cleaning and Prevention
Alcohol-based hand sanitizers do not work well against norovirus. This sets it apart from many other common infections. Soap and water is the effective option, and thorough handwashing is the single most important thing you can do to stop the spread.
For surfaces, regular household cleaners aren’t enough either. You need a bleach solution: 5 to 25 tablespoons of standard household bleach (5% to 8% concentration) per gallon of water. That translates to roughly one-third cup on the low end to about a cup and a half on the high end. Alternatively, look for a disinfectant specifically registered by the EPA as effective against norovirus. Pay special attention to bathrooms, kitchen surfaces, and any area that may have been contaminated by vomit or stool.
Wash any contaminated clothing or linens on the hottest setting available and dry them on high heat. Handle soiled items carefully, since the virus can become airborne briefly when you shake out fabric or clean up vomit.