Norovirus is a highly contagious virus that causes gastroenteritis, an inflammation of the stomach and intestines. It is commonly known as the “stomach flu” or “stomach virus,” although it is not related to influenza (the flu). This virus is responsible for approximately 50% of gastroenteritis outbreaks from food poisoning in the United States and spreads mainly through the consumption of contaminated food or water, as well as through direct contact with infected people or contaminated surfaces.
Symptoms and Duration
Typical symptoms of norovirus infection include:
- Watery diarrhea
- Severe vomiting
- Abdominal pain
- Nausea
These symptoms usually appear between 12 and 48 hours after exposure to the virus and can last from 1 to 3 days. In some cases, people may continue to shed the virus in their stool for weeks after recovery, which contributes to its spread.
Contagion and Prevention
Norovirus is considered extremely contagious; just a few virus particles are enough to infect a person. It spreads easily in places where people are in close contact, such as on cruise ships, schools, and family gatherings. To prevent infection, it is recommended to:
- Wash hands frequently with soap and water.
- Disinfect surfaces that may be contaminated.
- Avoid consuming raw or undercooked shellfish, which are common sources of the virus.
Current Situation in the United States
Recently, there has been a notable increase in norovirus cases in the United States, with more than ninety outbreaks reported in December 2024. This surge has raised concerns, as the virus is responsible for 58% of foodborne illnesses in the country.
In summary, although norovirus infection is uncomfortable and can be serious for certain vulnerable groups (such as young children and the elderly), it is generally not dangerous, and most people recover without specific treatment.
Important: Dehydration is a serious complication of norovirus, especially in young children, older adults, and people with weakened immune systems. If you experience severe symptoms or do not improve after a few days, it is important to see a doctor.
For more information, you can visit the following link from the Centers for Disease Control and Prevention (CDC):
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