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Norovirus, the Winter Vomiting Bug, On the Rise

A new norovirus strain was detected last year in Australia and has reached the United States.

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

The U.S. 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 is often referred to as the stomach flu, but it is unrelated to influenza.

A new norovirus strain, GII.4 Sydney, was detected last year in Australia.  The strain hit the U.K. and sickened over 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 also spread quickly in closed places like daycare 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°F, which makes eating raw fish, such as oysters, particularly dangerous.

Noroviruses 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, and
  • 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 noroviruses are relatively resistant. They can survive temperatures as high as 140°F 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 healthcare while you are sick and for at least 2 to 3 days after you recover.
  • This also applies to sick workers in schools, daycares, 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 (EPA).

5. Wash laundry thoroughly

Immediately remove and wash clothes or linens that may be contaminated with
vomit or stool (feces).

You should—

  • handle soiled items carefully without agitating them,
  • wear rubber or disposable gloves while handling soiled items and wash your hands after,
  • and wash the items with detergent
Msgoff January 29, 2013 at 02:15 AM
I find it absolutely amazing how many people DO NOT or DO NOT WANT TO wash their hands. As is said, "That's nasty!" Hand washing should be for at least 20 seconds with warm water and soap. Understand that bacteria does not play!! It is recommended to use soap and water, rather than antibacterial (alcohol) cleaners in the case of preventing Norovirus. I really wish health care personnel would use good hand washing rather than the alcohol hand cleaners, which most of them do not apply to all of the surfaces of the hand anyway. As I tell my grandchildren when we have to use hand "sanitizer," "Front, back, sides between fingers and all around." They actually think it's fun with my little rhythmic cadence. Another reminder, remember to cough into your elbow or inside your jacket, rather than coughing into your hand. When you cough into your hand and then shake someone else's hand, use a pen, touch the door, read a menu, etc. you are spreading those germs to others, especially when it is flu season.

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