title: Overrepresentation of influenza A(H1N1)pdm09 virus among severe influenza cases in the 2011/12 season in four European countries.
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.
authors.affiliation: European Centre for Disease Prevention and Control (ECDC), Stockholm, Sweden. Julien.Beaute@ecdc.europa.eu
authors.forename: J
authors.initials: J
authors.lastname: Beauté
authors.forename: E
authors.initials: E
authors.lastname: Broberg
authors.forename: F
authors.initials: F
authors.lastname: Plata
authors.forename: I
authors.initials: I
authors.lastname: Bonmarin
authors.forename: J
authors.initials: J
authors.lastname: O Donnell
authors.forename: C
authors.initials: C
authors.lastname: Delgado
authors.forename: N
authors.initials: N
authors.lastname: Boddington
authors.forename: R
authors.initials: R
authors.lastname: Snacken
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D002675:Child, Preschool; D005260:Female; D005602:France / Q000453:epidemiology; D006801:Humans; D053118:Influenza A Virus, H1N1 Subtype / Q000302:isolation & purification*; D007251:Influenza, Human / Q000175:diagnosis / Q000453:epidemiology*; D007494:Ireland / Q000453:epidemiology; D008297:Male; D008875:Middle Aged; D011159:Population Surveillance / Q000379:methods; D012621:Seasons; D012720:Severity of Illness Index; D013030:Spain / Q000453:epidemiology; D006113:United Kingdom / Q000453:epidemiology; D055815:Young Adult