'Did you have flu last week?' A telephone survey to estimate a point prevalence of influenza in the Swedish population

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.

Ingår i:Euro surveillance : bulletin Europeen sur les maladies transmissibles = European communicable disease bulletin: European Centre for Disease Control and Prevention (ECDC)10:12, s. 5-61560-7917

Av författaren/redakt...: Payne, L; Kühlmann-Berenzo ...; Ekdahl, K; Giesecke, J; Högberg, L; Penttinen, P

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