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'Did you have flu last week?’ A telephone survey to estimate a point prevalence of influenza in the Swedish population
Author(s) -
Lara Payne,
Sharon Kühlmann-Berenzon,
Karl Ekdahl,
Johan Giesecke,
Liselotte Diaz Högberg,
Pasi Penttinen
Publication year - 2005
Publication title -
euro surveillance/eurosurveillance
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.766
H-Index - 104
eISSN - 1560-7917
pISSN - 1025-496X
DOI - 10.2807/esm.10.12.00585-en
Subject(s) - medicine , influenza like illness , telephone survey , population , vaccination , epidemiology , influenza season , prevalence , demography , environmental health , pediatrics , influenza vaccine , virology , business , virus , marketing , sociology
Sentinel surveillance usually underestimates the true burden of influenza in a population, as individuals must present to medical establishments to be included in the surveillance system. We carried out a telephone survey to estimate the national burden of influenza in the Swedish population for one week during the 2004/05 influenza season. Fixed-line telephone numbers were randomly sampled and households interviewed concerning influenza illness between 14-20 February 2005 (Week 7 of 2005). Questions regarding seasonal influenza vaccination status, symptoms and the impact of illness on daily life were also included. A self-defined influenza prevalence of 7.7% in week 7 of 2005 was estimated. On applying a case definition of ‘cough and fever and muscle pain’ for influenza like illness, the prevalence decreased to 3.6%. The survey provided insight into the burden of illness in the population further to that estimated through the sentinel surveillance system.

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