Norovirus

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Nationally notifiable since 2007

1.0 National Notification

Only outbreaks should be notified.

2.0 Type of Surveillance

Outbreak reports

3.0 Case Classification

3.1 Confirmed case

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 unrelated* 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

4.0 Laboratory Comments

5.0 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.

6.0 ICD Code(s)

6.1 ICD-10 Code(s)

A08.1

Acute gastroenteropathy due to Norwalk agent

Small round structured virus enteritis

6.2 ICD-9/ICD-9CM Code(s)

008.63

Norwalk virus
Norwalk-like agent

7.0 Type of International Reporting

8.0 Comments

9.0 References

Date of Last Revision/Review:

November 2008