What is norovirus and is it dangerous?

Norovirus is a highly contagious virus that causes inflammation of the stomach and intestines, leading to vomiting and diarrhea. While most people recover within 1-3 days, it can be dangerous for young children, elderly individuals, and people with weakened immune systems due to severe dehydration. It's the leading cause of foodborne illness outbreaks worldwide.

How does norovirus spread so easily?

Norovirus spreads extremely easily through contaminated food or water, direct contact with infected people, or touching contaminated surfaces. It only takes a tiny amount (less than 100 viral particles) to cause infection. The virus can survive on surfaces for days and is resistant to many common disinfectants, making it particularly difficult to control.

What are the symptoms of norovirus?

Symptoms typically begin 12-48 hours after exposure and include sudden onset of nausea, vomiting, watery diarrhea, stomach cramps, and sometimes fever, headache, and body aches. The illness usually lasts 1-3 days, but you can still be contagious for up to 2 weeks after recovering.

Why doesn't hand sanitizer work against norovirus?

Alcohol-based hand sanitizers are less effective against norovirus compared to other viruses. The virus has no outer lipid envelope that alcohol can break down. The CDC recommends washing hands thoroughly with soap and water for at least 20 seconds, which physically removes the virus from your hands.

How can I clean up after someone with norovirus?

Use bleach-based cleaners (1000-5000 ppm chlorine) to disinfect surfaces. Clean up vomit and feces immediately, wearing gloves and a mask if possible. Wash contaminated laundry in hot water. The virus can survive on surfaces for days, so thorough cleaning is essential to prevent spread.

Where are norovirus outbreaks happening?

Norovirus outbreaks are common in closed or semi-closed environments like cruise ships, nursing homes, schools, and restaurants. Outbreaks peak during winter months but can occur year-round. Check the live outbreak data above for current norovirus activity in your area.

West Virginia

Norovirus in West Virginia

Norovirus is a highly contagious virus that causes acute gastroenteritis, inflammation of the stomach and intestines. Often called the 'stomach flu' or 'winter vomiting bug,' it is the leading cause of foodborne illness outbreaks worldwide.

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Qu'est-ce que Norovirus?

Norovirus is the leading cause of vomiting and diarrhea from acute gastroenteritis in the United States and globally. It causes approximately 21 million illnesses, 70,000 hospitalizations, and 800 deaths annually in the U.S. alone. The virus is extremely contagious - just a few viral particles can cause infection, and infected people can shed billions of virus particles.

Symptômes

Sudden onset of nausea and vomiting
Watery diarrhea
Stomach cramps and abdominal pain
Low-grade fever
Body aches and headache
Fatigue and weakness

Transmission

Norovirus spreads through contaminated food or water, contact with contaminated surfaces, and direct person-to-person contact. The virus is extremely contagious and only a few viral particles are needed to cause infection. Outbreaks are common in closed environments like cruise ships, schools, and nursing homes.

Période de Contagiosité : From symptom onset through at least 3 days after recovery (virus can be shed up to 2 weeks)

Prévention

Thorough handwashing with soap and water (alcohol sanitizers less effective)
Wash fruits and vegetables before eating
Cook shellfish thoroughly
Clean and disinfect contaminated surfaces with bleach-based cleaners
Stay home when sick and for 48 hours after symptoms resolve
Avoid preparing food for others when ill
Wash laundry thoroughly if contaminated

West Virginia Ressources Santé

Informations du département de santé local et directives de prévention spécifiques à l'état

Nous Surveillons West Virginia

Notre surveillance alimentée par IA surveille en continu l'activité de Norovirus dans tout West Virginia. Nous suivons les données des services de santé des états, des hôpitaux locaux, des rapports du CDC et de plus de 50 sources de santé mondiales pour fournir une alerte précoce sur les menaces émergentes.

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West Virginia Département de Santé

Pour les alertes officielles de santé de l'état, les lieux de vaccination et les directives de santé publique spécifiques à West Virginia, visitez le site web du département de santé de votre état.

→ West Virginia Département de Santé → CDC Norovirus Information → CDC Health Topics

Understanding Norovirus: Key Questions

Que vous viviez dans West Virginia or are traveling there, knowing the symptoms, timeline, and when to seek care helps you act quickly if exposure occurs.

Quand Consulter un Médecin

Seek care if you experience severe dehydration, bloody stools, high fever, or symptoms lasting more than 3 days. Children under 5, adults over 65, and immunocompromised individuals should seek care earlier.

Symptômes d'urgence : Severe dehydration, inability to keep fluids down for 12 or more hours, or neurological symptoms require emergency care.

Ressources Expertes et Références

Informations fiables provenant des principales organisations de santé

CDC

Directives officielles des Centers for Disease Control and Prevention des États-Unis

Voir les Ressources du CDC →

WHO

Surveillance mondiale des maladies et directives de l'Organisation Mondiale de la Santé

Voir les Ressources de l'OMS →

Recherche

Dernières recherches évaluées par les pairs et études cliniques

Voir la Recherche →

Contenu Révisé Médicalement

Les informations sur les maladies sur Virus Watcher sont révisées par notre Épidémiologiste en Chef, ancien analyste principal du CDC pour les prévisions FluSight. Les données épidémiques sont agrégées à partir de sources vérifiées notamment BEACON, ProMED, OMS, CDC et plus de 50 agences nationales de santé. Ces informations sont à des fins éducatives et ne doivent pas remplacer les conseils médicaux professionnels.

Dernière révision : 2026-08-13

Recent Norovirus Reports

No confirmed cases reported in West Virginia yet. Here are the latest Norovirus reports from our global surveillance network.

Roughly a dozen hikers have reportedly fallen ill with a nasty stomach bug after traversing a section of the scenic Pacific Crest Trail. The popular hiking destination spans more than 2,600 miles and goes from Mexico to Canada through California, Oregon and Washington. The Paci…

United States Minor Outlying Islands · Baker Island · 2026-06-01

Recent outbreaks of hantavirus and norovirus on cruise ships are making headlines, but they're unlikely to dim the growing popularity of vacation cruises, according to industry representatives and travel experts. In fact, many within the industry still expect a record number of …

France · Île-de-France · 2026-05-17

MAY 26 -- When news emerged of a norovirus outbreak aboard the Caribbean Princess cruise ship recently, many Malaysians may not have paid much attention to it. Stomach bugs during travel are often assumed to be routine food poisoning or a minor inconvenience that passes after a d…

United States Minor Outlying Islands · Baker Island · 2026-05-28

Norovirus cases are sharply rising acrossUS, CDC data and wastewater show massive spread, officials urge hygiene, handwashing and staying home to prevent dehydration and outbreaks A highly contagious stomach virus commonly known as the "vomit bug" is spreading across the United …

United States Minor Outlying Islands · Baker Island · 2026-05-31

BORDEAUX, France -- Passengers unaffected by an illness outbreak on a British cruise ship have been allowed off the ship in the French port city of Bordeaux, while authorities confirmed the cause of the outbreak is norovirus, a nasty stomach bug that spreads easily. French author…

France · 2026-05-15

Nearly two dozen people got sick with norovirus onboard a National Geographic-Lindblad Expeditions ship, marking the vessel's second outbreak in roughly a month. Among the 68 guests sailing on National Geographic Sea Bird, 19 reported being ill during a voyage that ended on June…

United States Minor Outlying Islands · Baker Island · 2026-07-03

The CDC is investigating a third gastrointestinal illness outbreak aboard a National Geographic cruise ship. Nearly 20 people got sick with gastrointestinal illness on a National Geographic-Lindblad Expeditions ship, marking the vessel's third outbreak in less than two months. …

United States Minor Outlying Islands · Baker Island · 2026-07-18

This event envelope contains reports on norovirus outbreaks in the USA. *Source: BEACON* - [View Full Report](https://beaconbio.org/en/event/?eventid=4de82455-1c8b-4d54-afbb-ca7bed7187ac)

United States · 2026-05-26

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Questions Fréquemment Posées

Questions fréquentes sur Norovirus répondues par notre équipe d'épidémiologie

Maladies Associées

Suivez d'autres maladies aux symptômes ou modes de transmission similaires

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Obtenez Norovirus Alertes pour West Virginia

Recevez des notifications instantanées lorsque l'activité de Norovirus augmente dans West Virginia ou vos destinations de voyage. Suivez plus de 200 maladies avec des alertes géolocalisées. Utilisé par les systèmes de santé, les services médicaux d'urgence, les écoles et les voyageurs du monde entier.