National case definition: Norovirus

Date of last revision: November 2008

National notification

Only outbreaks should be notified.

Type of surveillance

Outbreak reports

Case classification – outbreak

Confirmed outbreak

Two or more cases of clinical illness compatible with norovirus that can be epidemiologically linked to one another (i.e. associated by exposure with onsets within a 1-3 day period), at least one of which is laboratory confirmed:

Clinical evidence

Clinical illness is characterized by acute onset of nausea, vomiting, diarrhea, abdominal pain, myalgia, headache, malaise, low-grade fever or a combination of these symptoms, lasting 24 to 48 hours.

ICD code(s)

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