tetano
Editor, Senior Moderator
Eurosurveillance, Volume 17, Issue 9, 01 March 2012
Rapid communications
Overrepresentation of influenza A(H1N1)pdm09 virus among severe influenza cases in the 2011/12 season in four European countries
J Beaut? ()1, E Broberg1, F Plata1, I Bonmarin2, J O?Donnell3, C Delgado4, N Boddington5, R Snacken1
European Centre for Disease Prevention and Control (ECDC), Stockholm, Sweden
Institut de Veille Sanitaire (InVS), Saint-Maurice, France
Health Protection Surveillance Centre, Dublin, Ireland
Centro Nacional de Epidemiolog?a (National Centre of Epidemiology), Instituto de Salud Carlos III, Madrid, Spain
Respiratory Diseases Department, Health Protection Agency, London, United Kingdom
Citation style for this article: Beaut? 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)
ii=20105. Available online: http://www.eurosurveillance.org/ViewArticle.aspx?ArticleId=20105
Date of submission: 22 February 2012
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.
The 2010/11 influenza season in Europe was dominated by influenza A(H1N1)pdm09 viruses, but influenza B viruses also circulated widely, being the dominant type in some countries such as Ireland [1]. In hospitalised cases, the A(H1N1)pdm09 virus was by far the most common virus reported. The 2011/12 influenza season started around week 52 when more than 10% of sentinel samples from the community tested positive for influenza virus [2]. In week 5 of 2012, as influenza activity was increasing throughout Europe, 42% of sentinel specimens tested positive for influenza virus, of which 89% were subtyped as A(H3) [3]. Here we report the distribution of virus strains in hospitalised cases for the 2011/12 season which differed markedly from those seen in primary care.
...
http://www.eurosurveillance.org/ViewArticle.aspx?ArticleId=20105
Rapid communications
Overrepresentation of influenza A(H1N1)pdm09 virus among severe influenza cases in the 2011/12 season in four European countries
J Beaut? ()1, E Broberg1, F Plata1, I Bonmarin2, J O?Donnell3, C Delgado4, N Boddington5, R Snacken1
European Centre for Disease Prevention and Control (ECDC), Stockholm, Sweden
Institut de Veille Sanitaire (InVS), Saint-Maurice, France
Health Protection Surveillance Centre, Dublin, Ireland
Centro Nacional de Epidemiolog?a (National Centre of Epidemiology), Instituto de Salud Carlos III, Madrid, Spain
Respiratory Diseases Department, Health Protection Agency, London, United Kingdom
Citation style for this article: Beaut? 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)
ii=20105. Available online: http://www.eurosurveillance.org/ViewArticle.aspx?ArticleId=20105Date of submission: 22 February 2012
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.
The 2010/11 influenza season in Europe was dominated by influenza A(H1N1)pdm09 viruses, but influenza B viruses also circulated widely, being the dominant type in some countries such as Ireland [1]. In hospitalised cases, the A(H1N1)pdm09 virus was by far the most common virus reported. The 2011/12 influenza season started around week 52 when more than 10% of sentinel samples from the community tested positive for influenza virus [2]. In week 5 of 2012, as influenza activity was increasing throughout Europe, 42% of sentinel specimens tested positive for influenza virus, of which 89% were subtyped as A(H3) [3]. Here we report the distribution of virus strains in hospitalised cases for the 2011/12 season which differed markedly from those seen in primary care.
...
http://www.eurosurveillance.org/ViewArticle.aspx?ArticleId=20105