Norovirus Bug On the Rise; New Strain Arrives in United States

Review these five tips to prevent the extremely contagious illness from spreading.

Although the flu is on everyone’s mind this season, the winter vomiting bug, or the norovirus, also is making its rounds.

The United States Centers for Disease Control and Prevention (CDC) reports that the norovirus causes about 70,000 hospitalizations and 800 deaths each year, mostly in young children and the elderly.

Some of the virus' common symptoms include nausea, vomiting, diarrhea and stomach pains. The CDC points out that the norovirus often is referred to as the stomach flu, but is unrelated to influenza.

A new norovirus strain, GII.4 Sydney, was detected last year in Australia. It hit the United Kingdom and sickened more than a million people. It has now reached the United States and this new strain appears to be taking over. Of norovirus cases reported from September to December, 54 percent have been identified as GII.4 Sydney, according to recently released data.

The first norovirus outbreak was reported in Ohio in 1968. Today, approximately 21 million illnesses are attributable to norovirus in the U.S. each year, reports the CDC. Of those, approximately 25 percent can be attributed to foodborne transmissions. The norovirus can spread quickly in closed places like day care centers, nursing homes, schools and cruise ships.

This hardy virus is extremely contagious. The BBC reports that norovirus is one of the few infections you can catch from a toilet seat. The virus can survive temperatures as high as 140 degrees, which makes eating raw seafood, such as oysters, particularly dangerous.

Norovirus can live in vomit or stool even before a person experiences symptoms, and up to two weeks after symptoms disappear. People are most contagious when they experience symptoms and during the first three days after recovery, reports the CDC.  

There is no treatment or vaccine against norovirus. To help prevent contamination, the CDC recommends the following tips:

5 Tips to Prevent Norovirus From Spreading

1. Practice proper hand hygiene

Always wash your hands carefully with soap and water:

  • after using the toilet and changing diapers.
  • before eating, preparing or handling food.
  • Alcohol-based hand sanitizers can be used in addition to hand washing. But, they should not be used as a substitute for washing with soap and water.

2. Wash fruits and vegetables and cook seafood thoroughly.

  • Carefully wash fruits and vegetables before preparing and eating them.
  • Cook oysters and other shellfish thoroughly before eating them.
  • Be aware that norovirus is relatively resistant. It can survive temperatures as high as 140 degrees and quick steaming processes that are often used for cooking shellfish. Food that might be contaminated with norovirus should be thrown out.
  • Keep sick infants and children out of areas where food is being handled and prepared.

3. When you are sick, do not prepare food or care for others.

  • You should not prepare food for others or provide health care while you are sick and for at least 2 to 3 days after you recover.
  • This also applies to sick workers in schools, day cares and other places where they may expose people to norovirus.

4. Clean and disinfect contaminated surfaces.

  • After throwing up or having diarrhea, immediately clean and disinfect contaminated surfaces.
  • Use a chlorine bleach solution with a concentration of 1000–5000 ppm (5–25 tablespoons of household bleach [5.25%] per gallon of water) or other disinfectant registered as effective against norovirus by the Environmental Protection Agency.

5. Wash laundry thoroughly.

Immediately remove and wash clothes or linens that may be contaminated with
vomit or feces. You should:

  • handle soiled items carefully without agitating them.
  • wear rubber or disposable gloves while handling soiled items and wash your hands afterward.
  • wash the items with detergent.


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