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:
- Community outbreak:
- Two or more unrelatedFootnote * cases of illness compatible with norovirus that can be epidemiologically linked to one another
- Institutional outbreak:
- Two or more cases of clinical illness compatible with norovirus that are epidemiologically linked in an institutional setting
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)
- ICD-10 code(s)
- A08.1 Acute gastroenteropathy due to Norwalk agent
- Small round structured virus enteritis
- A08.1 Acute gastroenteropathy due to Norwalk agent
- ICD-9CM code(s)
- 008.63 Norwalk virus
- Norwalk-like agent
Footnotes
- Footnote *
-
Do not live in a common household, excluding institutions
- 008.63 Norwalk virus
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