Overrepresentation of influenza A(H1N1)pdm09 virus among severe influenza cases in the 2011/12 season in four European countries

J Beauté; E Broberg; F Plata; I Bonmarin; J O’Donnell; C Delgado; N Boddington; R Snacken

doi:10.2807/ese.17.09.20105-en

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Overrepresentation of influenza A(H1N1)pdm09 virus among severe influenza cases in the 2011/12 season in four European countries
J Beauté¹ , E Broberg¹ , F Plata¹ , I Bonmarin² , J O’Donnell³ , C Delgado⁴ , N Boddington⁵ , R Snacken¹
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Affiliations: ¹ European Centre for Disease Prevention and Control (ECDC), Stockholm, Sweden ² Institut de Veille Sanitaire (InVS), Saint-Maurice, France ³ Health Protection Surveillance Centre, Dublin, Ireland ⁴ Centro Nacional de Epidemiología (National Centre of Epidemiology), Instituto de Salud Carlos III, Madrid, Spain ⁵ Respiratory Diseases Department, Health Protection Agency, London, United Kingdom

Correspondence:
J Beauté
Julien.Beaute ecdc.europa.eu
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Citation style for this article: Beauté J, Broberg E, Plata F, Bonmarin I, O’Donnell J, Delgado C, Boddington N, Snacken R. Overrepresentation of influenza A(H1N1)pdm09 virus among severe influenza cases in the 2011/12 season in four European countries. Euro Surveill. 2012;17(9):pii=20105. https://doi.org/10.2807/ese.17.09.20105-en Received: 22 Feb 2012

Abstract

In France, Ireland, Spain and the United Kingdom, the influenza season 2011/12 started in the final weeks of 2011 and has been dominated by influenza A(H3) viruses with minimal circulation of influenza A(H1N1)pdm09 and B viruses. A relatively greater proportion, however, of influenza A(H1N1)pdm09 viruses were reported in hospitalised laboratory-confirmed influenza cases in four countries. Compared to the season 2010/11, the proportion of subtype A(H3) among hospitalised cases has increased, associated with a larger proportion of cases in the youngest and oldest age groups.