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Annual Statistics for the Norwegian Syndromic Surveillance System (NorSySS)

Published Updated

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NorSySS is a surveillance system for communicable diseases. The system is based on the number of consultations at GPs and out-of-hours primary care facilities in Norway.


The purpose of NorSySS is to detect outbreaks of communicable diseases as early as possible so that infection control measures can be introduced. NorSySS can also describe the spread of infectious diseases at municipal, county and country level so that district medical officers can introduce and monitor infection control measures.

NorSySS shows how many consultations with a diagnosis there have been at the country's GPs and out-of-hours primary care facilities. Trends and possible disease outbreaks that require medical attention can be detected. These numbers do not indicate how many people have a certain diagnosis in the population, as a person may contact their doctor several times with the same diagnosis and many do not contact their doctor at all. The diagnosis recorded by doctors is based on patient symptoms. Often, the diagnosis is unconfirmed by a laboratory examination.

Total number of consultations

In the last few years, between 23 and 25 million consultations were registered in NorSySS per year. The number has increased since 2006, peaking in 2011 at 24.9 million. There has been no analysis of why the number has varied over the years.

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Figure 1: Consultations in Norway, 2006-2017-

Gastrointestinal infections

Gastrointestinal infections are a collective term for the diagnosis codes (ICPC-2) D11-Diarrhoea, D70-Gastrointestinal infection and D73-Gastroenteritis presumed infection. The number of consultations with these diagnostic codes has increased somewhat since 2006, but has remained stable over recent years, with over 200,000 consultations per year.

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Figure 2Number of consultations for gastrointestinal infections 2006 - 2017. 

Respiratory infections

Respiratory infections are a collective term for the diagnosis codes (ICPC-2) R05-Cough, R74-Upper respiratory infection acute, R78-Acute bronchitis / bronchiolitis and R83 Respiratory infection other. For these codes, there were just under 1.2 million consultations per year, except in 2011 and 2012 with over 1.3 million consultations. There have been no analysis of why there was an increase in these years.

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Figure 3: Number of consultations for respiratory infections 2006 - 2017.

*KUHR = control and payment of health reimbursements
*ICPC-2 codes = International Classification of Primary Care