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. 2019 Feb;24(9):1900125.
doi: 10.2807/1560-7917.ES.2019.24.9.1900125.

Co-circulation of influenza A(H1N1)pdm09 and influenza A(H3N2) viruses, World Health Organization (WHO) European Region, October 2018 to February 2019

Hannah Segaloff  1 , Angeliki Melidou  2 , Cornelia Adlhoch  2 , Dmitriy Pereyaslov  1 , Emmanuel Robesyn  2 , Pasi Penttinen  2 , Sonja J Olsen  1 , Who European Region  1   2   3 ; European Influenza Surveillance Network  3 ; WHO European Region and European Influenza Surveillance Network
Collaborators, Affiliations

Co-circulation of influenza A(H1N1)pdm09 and influenza A(H3N2) viruses, World Health Organization (WHO) European Region, October 2018 to February 2019

Hannah Segaloff et al. Euro Surveill. 2019 Feb.

Abstract

In the World Health Organization European Region, the 2018/19 influenza season started in week 49 2018, crossing 10% virus-positivity in sentinel surveillance specimens. At week 5 2019, activity remained elevated with positivity rates at 55%. Both A(H1N1)pdm09 and A(H3N2) viruses circulated widely and detection levels in primary care and hospital settings were similar to past seasons. Hospitalisation data may suggest an increased susceptibility to A(H1N1)pdm09 virus in older age groups.

Keywords: Europe, surveillance; epidemiology; influenza.

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Conflict of interest statement

Conflict of interest: None declared.

Figures

Figure 1
Figure 1
Percentage of sentinel ILI/ARI specimens testing positive for influenza, by season, 50 World Health Organization European Region Member States and Kosovo*, influenza seasons 2014/15–2018/19
Figure 2
Figure 2
Distribution of dominant patterns of influenza virus type circulating, World Health Organization European Region, week 40 2018–week 5 2019
Figure 3
Figure 3
Numbera, subtype and percent positivity of specimens from severe acute respiratory infection surveillance by season, World Health Organization European Region Member States, influenza season 2014/15–2018/19
Figure 4
Figure 4
Age group distribution for influenza A(H1N1)pdm09 and A(H3N2) cases in the intensive care unit in the (A) 2018/19 and (B) 2014/15 influenza seasons, World Health Organization European Region Member States
See this image and copyright information in PMC

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