Norovirus clusters reported in Delaware

January 18, 2013

The Delaware Division of Public Health is urging the public to take precautions to prevent possible exposure and spread of norovirus, an illness that typically occurs during the winter months. After the first report received on Jan. 3, DPH has investigated a number of suspected and confirmed norovirus outbreaks.  The norovirus is not related to influenza nor linked to the high number of influenza cases so far this flu season.

Gastrointestinal illness caused by norovirus is unpleasant and can be severe for those who are elderly or have an underlying health condition. Symptoms include nausea, vomiting, diarrhea and stomach cramping. Some people may experience fever, chills, headache, muscle aches, or a general sense of tiredness. The symptoms can begin suddenly and an infected person may go from feeling well to very sick in a very short period of time.

In most people, the illness lasts for one to two days. People with norovirus illness are contagious from the moment they begin feeling sick until at least three days after they recover; some people may be contagious for even longer. Infection can be more severe in young children and elderly people.

Dehydration can occur rapidly and may require medical treatment or hospitalization. Although there are no specific medications to treat norovirus, drinking plenty of liquids to prevent dehydration is important.

Noroviruses are easily transmitted by touching a contaminated surface as well as by direct contact with an infected person or by eating food or drinking liquids that have been contaminated with the virus.

The best course of action is prevention. DPH recommends the following steps to prevent exposure to and spread of norovirus.

• Noroviruses can be difficult to kill with normal cleaning and disinfecting procedures. Surfaces that have been contaminated with stool or vomit should be cleaned immediately and disinfected with a freshly prepared diluted bleach solution (one part bleach: 10 parts water) or a bleach-based household cleaner. Never use undiluted bleach.)

• If ill with vomiting or diarrhea, do not go to work, school, or attend daycare.

• Healthcare facilities, such as nursing homes and hospitals, may restrict visitation of sick family members or friends for the safety of not only the ill persons but also the visitors.

• Wash hands frequently and thoroughly with soap and water. This is one of the most effective ways to protect oneself and others against norovirus since hand sanitizers alone are not as effective against the virus as handwashing.

For more information about norovirus, go to

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