Transcript Influenza surveillance in Norway

NORWEGIAN I NSTITUTE OF PUBLI C HEALTH
DEPARTMENT OF INFECTIOUS DISEASE EPIDEMI OLOGY
Influenza surveillance in
Norway
Dr. Hans Blystad ([email protected])
Norwegian Institute of Public Health
November 2005
Influenza surveillance Norway
• From 1975 to 1998 aggregated data (no of
cases) were collected weekly from all doctors
• Since 1999 a sentinel surveillance system
introduced with 201 selected reporting units from
all parts of Norway. Reporting weekly from week
40 till week 20 the following year
• Voluntary reporting system from laboratories on
diagnosed influenzavirus
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9
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11
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9
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17
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Influenza
reporting
units i
Norway
(n=201)
Data collected in the
influenza season by
201 reporting units
(by age group):
• no. of cases of
influenzalike illness
per week
• no. of total patients
treated per week
• total number of
patients on the
doctor`s list
Influenza surveillance Norway –
weekly reporting in the influenza season
Reported data influenza season
1999-2005
week