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Age-specific differences in influenza virus type and subtype distribution in the 2012/2013 season in 12 European countries.

Beauté J, Zucs P, Korsun N, Bragstad K, Enouf V, Kossyvakis A, Griškevičius A, Olinger CM, Meijer A, Guiomar R, Prosenc K, Staroňová E, Delgado C, Brytting M, Broberg E, European Influenza Surveillance Netwo - Epidemiol. Infect. (2015)

Bottom Line: Thus, in cases aged 5-14 years, 75% tested positive for influenza B virus whereas all other age groups had an even distribution of influenza A and B viruses.This means that the intepretation of syndromic surveillance data without age group-specific virological data may be misleading.Surveillance at the European level would benefit from the reporting of age-specific influenza data.

View Article: PubMed Central - PubMed

Affiliation: European Centre for Disease Prevention and Control (ECDC),Solna,Sweden.

ABSTRACT
The epidemiology of seasonal influenza is influenced by age. During the influenza season, the European Influenza Surveillance Network (EISN) reports weekly virological and syndromic surveillance data [mostly influenza-like illness (ILI)] based on national networks of sentinel primary-care providers. Aggregated numbers by age group are available for ILI, but not linked to the virological data. At the end of the influenza season 2012/2013, all EISN laboratories were invited to submit a subset of their virological data for this season, including information on age. The analysis by age group suggests that the overall distribution of circulating (sub)types may mask substantial differences between age groups. Thus, in cases aged 5-14 years, 75% tested positive for influenza B virus whereas all other age groups had an even distribution of influenza A and B viruses. This means that the intepretation of syndromic surveillance data without age group-specific virological data may be misleading. Surveillance at the European level would benefit from the reporting of age-specific influenza data.

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Number of influenza-positive sentinel specimens and percentage* by type, (sub)type and week. (a) European Union/European Economic Area (EU/EEA), (b) 12 EU countries†, week 40/2012 to week 20/2013. (* Percentages are displayed in weeks where at least 50 influenza-positive specimens were reported; † Bulgaria, Denmark, France, Greece, Lithuania, Luxembourg, The Netherlands, Portugal, Slovakia, Slovenia, Spain, and Sweden.
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fig01: Number of influenza-positive sentinel specimens and percentage* by type, (sub)type and week. (a) European Union/European Economic Area (EU/EEA), (b) 12 EU countries†, week 40/2012 to week 20/2013. (* Percentages are displayed in weeks where at least 50 influenza-positive specimens were reported; † Bulgaria, Denmark, France, Greece, Lithuania, Luxembourg, The Netherlands, Portugal, Slovakia, Slovenia, Spain, and Sweden.

Mentions: At the EU/EEA level, the 2012/2013 influenza season started about week 49/2012, had a prolonged peak between week 4/2013 and week 8/2013 and lasted until week 16/2013 (Fig. 1a). The epidemic peak occurred in week 6/2013, when 1632 of the 2607 sentinel swabs collected (63%) tested positive for influenza virus in 29 countries. From week 40/2012 to week 20/2013, these 29 countries tested 33 819 specimens, of which 15 744 (47%) tested positive for influenza virus.Fig. 1.


Age-specific differences in influenza virus type and subtype distribution in the 2012/2013 season in 12 European countries.

Beauté J, Zucs P, Korsun N, Bragstad K, Enouf V, Kossyvakis A, Griškevičius A, Olinger CM, Meijer A, Guiomar R, Prosenc K, Staroňová E, Delgado C, Brytting M, Broberg E, European Influenza Surveillance Netwo - Epidemiol. Infect. (2015)

Number of influenza-positive sentinel specimens and percentage* by type, (sub)type and week. (a) European Union/European Economic Area (EU/EEA), (b) 12 EU countries†, week 40/2012 to week 20/2013. (* Percentages are displayed in weeks where at least 50 influenza-positive specimens were reported; † Bulgaria, Denmark, France, Greece, Lithuania, Luxembourg, The Netherlands, Portugal, Slovakia, Slovenia, Spain, and Sweden.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4595855&req=5

fig01: Number of influenza-positive sentinel specimens and percentage* by type, (sub)type and week. (a) European Union/European Economic Area (EU/EEA), (b) 12 EU countries†, week 40/2012 to week 20/2013. (* Percentages are displayed in weeks where at least 50 influenza-positive specimens were reported; † Bulgaria, Denmark, France, Greece, Lithuania, Luxembourg, The Netherlands, Portugal, Slovakia, Slovenia, Spain, and Sweden.
Mentions: At the EU/EEA level, the 2012/2013 influenza season started about week 49/2012, had a prolonged peak between week 4/2013 and week 8/2013 and lasted until week 16/2013 (Fig. 1a). The epidemic peak occurred in week 6/2013, when 1632 of the 2607 sentinel swabs collected (63%) tested positive for influenza virus in 29 countries. From week 40/2012 to week 20/2013, these 29 countries tested 33 819 specimens, of which 15 744 (47%) tested positive for influenza virus.Fig. 1.

Bottom Line: Thus, in cases aged 5-14 years, 75% tested positive for influenza B virus whereas all other age groups had an even distribution of influenza A and B viruses.This means that the intepretation of syndromic surveillance data without age group-specific virological data may be misleading.Surveillance at the European level would benefit from the reporting of age-specific influenza data.

View Article: PubMed Central - PubMed

Affiliation: European Centre for Disease Prevention and Control (ECDC),Solna,Sweden.

ABSTRACT
The epidemiology of seasonal influenza is influenced by age. During the influenza season, the European Influenza Surveillance Network (EISN) reports weekly virological and syndromic surveillance data [mostly influenza-like illness (ILI)] based on national networks of sentinel primary-care providers. Aggregated numbers by age group are available for ILI, but not linked to the virological data. At the end of the influenza season 2012/2013, all EISN laboratories were invited to submit a subset of their virological data for this season, including information on age. The analysis by age group suggests that the overall distribution of circulating (sub)types may mask substantial differences between age groups. Thus, in cases aged 5-14 years, 75% tested positive for influenza B virus whereas all other age groups had an even distribution of influenza A and B viruses. This means that the intepretation of syndromic surveillance data without age group-specific virological data may be misleading. Surveillance at the European level would benefit from the reporting of age-specific influenza data.

Show MeSH
Related in: MedlinePlus