What is norovirus?
Norovirus is a virus that causes acute gastroenteritis, an infection of the digestive tract (stomach and intestine). Norovirus outbreaks occur in B.C. communities every year. Outbreaks occur year round but are more common in the winter months. Outbreaks of illness are common in nursing homes, daycare centres, schools, children’s camps and on cruise ships.
What are the symptoms?
Within 1 to 2 days of being exposed to norovirus you may have the following symptoms: an upset stomach, vomiting, and/or diarrhea. Other symptoms include nausea, cramping, chills and fever.
The illness usually begins suddenly and lasts for 1 to 3 days. Complications may occur if you lose too much fluid from vomiting and diarrhea and do not drink enough fluids. This is called dehydration. Symptoms of dehydration include: less urination, a dry mouth and throat, and dizziness. This is more likely to occur with babies and the elderly. Severe illness is very rare and hospital care is usually not needed.
How does the virus spread?
Norovirus is found in the vomit and diarrhea of people who are sick. When someone vomits, people nearby may become infected by swallowing tiny droplets from the air.
The virus can also spread from surfaces like countertops or sink taps. The virus can survive for a long time on these surfaces if they are not properly cleaned. You can become ill when you touch these surfaces and then place your hands or fingers in your mouth.
The virus can also spread if an infected person does not wash their hands or if someone with this illness handles food, water or ice.
Some foods can be contaminated with the virus at their source. For example, shellfish may be contaminated by sewage water before they are harvested.
Is there a treatment?
Medications are not usually used to treat norovirus. People infected with norovirus usually get better within a few days.
Antibiotics should not be taken for norovirus. Antibiotics only work to fight bacteria and not viruses.
It is important that you drink enough clear fluids, such as water, so you do not get dehydrated. You could also drink fluids such as juices, clear soups, or oral rehydration fluids for vomiting or diarrhea.
See a health care provider if diarrhea or vomiting lasts more than 2 or 3 days, or if dehydration is a concern.
How can you prevent infection with the virus?
There is no vaccine or medication that can prevent norovirus infection. The best way to prevent infection is to stop the virus from spreading. To help stop the spread of the virus, follow these tips:
- Wash your hands, especially after using the toilet, changing diapers or before eating or preparing food. Proper hand washing requires running water, soap and cleansing of the hands for about 20 seconds. For more information see HealthLinkBC File #85 Hand washing: Help stop the spread of germs
- Disinfect bathrooms used by sick people with a freshly made 1:50 solution of bleach and water