Giuseppe
Emeritus
[Source: Eurosurveillance, full text: (LINK). Abstract, edited.]
Eurosurveillance, Volume 16, Issue 18, 05 May 2011
Research articles
WEB QUERY-BASED SURVEILLANCE IN SWEDEN DURING THE INFLUENZA A(H1N1)2009 PANDEMIC, APRIL 2009 TO FEBRUARY 2010
A Hulth 1, G Rydevik 1
1) Swedish Institute for Communicable Disease Control, Solna, Sweden
Citation style for this article: Hulth A, Rydevik G. Web query-based surveillance in Sweden during the influenza A(H1N1)2009 pandemic, April 2009 to February 2010. Euro Surveill. 2011;16(18)
ii=19856. Available online: http://www.eurosurveillance.org/ViewArticle.aspx?ArticleId=19856
Date of submission: 12 January 2011
At the Swedish Institute for Communicable Disease Control, statistical models based on queries submitted to a Swedish medical website are used as a complement to the regular influenza surveillance. The models have previously been shown to perform well for seasonal influenza. The purpose of the present study was to evaluate the performance of the statistical models in the context of the influenza A(H1N1)2009 pandemic, a period when many factors, for example the media, could have influenced people's search behaviour on the Internet and consequently the performance of the models. Our evaluation indicates consistent good reliability for the statistical models also during the pandemic. When compared to Google Flu Trends for Sweden, they were at least equivalent in terms of estimating the influenza activity, and even seemed to be more precise in estimating the peak incidence of the influenza pandemic.
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Eurosurveillance, Volume 16, Issue 18, 05 May 2011
Research articles
WEB QUERY-BASED SURVEILLANCE IN SWEDEN DURING THE INFLUENZA A(H1N1)2009 PANDEMIC, APRIL 2009 TO FEBRUARY 2010
A Hulth 1, G Rydevik 1
1) Swedish Institute for Communicable Disease Control, Solna, Sweden
Citation style for this article: Hulth A, Rydevik G. Web query-based surveillance in Sweden during the influenza A(H1N1)2009 pandemic, April 2009 to February 2010. Euro Surveill. 2011;16(18)
ii=19856. Available online: http://www.eurosurveillance.org/ViewArticle.aspx?ArticleId=19856Date of submission: 12 January 2011
At the Swedish Institute for Communicable Disease Control, statistical models based on queries submitted to a Swedish medical website are used as a complement to the regular influenza surveillance. The models have previously been shown to perform well for seasonal influenza. The purpose of the present study was to evaluate the performance of the statistical models in the context of the influenza A(H1N1)2009 pandemic, a period when many factors, for example the media, could have influenced people's search behaviour on the Internet and consequently the performance of the models. Our evaluation indicates consistent good reliability for the statistical models also during the pandemic. When compared to Google Flu Trends for Sweden, they were at least equivalent in terms of estimating the influenza activity, and even seemed to be more precise in estimating the peak incidence of the influenza pandemic.
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