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Abstract

Background

Influenza viruses can cause large seasonal epidemics with high healthcare impact and severity as they continually change their virological properties such as genetic makeup over time.

Aim

We aimed to monitor the characteristics of circulating influenza viruses over the 2022/23 influenza season in the EU/EEA countries. In addition, we wanted to compare how closely the circulating viruses resemble the viral components selected for seasonal influenza vaccines, and whether the circulating viruses had acquired resistance to commonly used antiviral drugs.

Methods

We performed a descriptive analysis of the influenza virus detections and characterisations reported by National Influenza Centres (NIC) from the 30 EU/EEA countries from week 40/2022 to week 39/2023 to The European Surveillance System (TESSy) as part of the Global Influenza Surveillance and Response System (GISRS).

Results

In the EU/EEA countries, the 2022/23 influenza season was characterised by co-circulation of A(H1N1)pdm09, A(H3N2) and B/Victoria-lineage viruses. The genetic evolution of these viruses continued and clade 6B.1A.5a.2a of A(H1N1)pdm09, 3C.2a1b.2a.2b of A(H3N2) and V1A.3a.2 of B/Victoria viruses dominated. Influenza B/Yamagata-lineage viruses were not reported.

Discussion

The World Health Organization (WHO) vaccine composition recommendation for the northern hemisphere 2023/24 season reflects the European virus evolution, with a change of the A(H1N1)pdm09 component, while keeping the A(H3N2) and B/Victoria-lineage components unchanged.

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/content/10.2807/1560-7917.ES.2024.29.39.2400020
2024-09-26
2024-11-21
http://instance.metastore.ingenta.com/content/10.2807/1560-7917.ES.2024.29.39.2400020
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Co-circulation of seasonal influenza A(H1N1)pdm09, A(H3N2) and B/Victoria lineage viruses with further genetic diversification, EU/EEA, 2022/23 influenza season
<p class="citation"> <span>Citation style for this article:</span> <span class="meta-value authors"> <a href="/search?value1=Eeva+K+Broberg&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Broberg Eeva K</a>, <a href="/search?value1=Olov+Svartstr%C3%B6m&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Svartström Olov</a>, <a href="/search?value1=Maximilian+Riess&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Riess Maximilian</a>, <a href="/search?value1=Annette+Kraus&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Kraus Annette</a>, <a href="/search?value1=Maja+Vukovikj&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Vukovikj Maja</a>, <a href="/search?value1=Angeliki+Melidou&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Melidou Angeliki</a>, <a href="/search?value1=Members+of+the+European+Reference+Laboratory+Network+for+Human+Influenza+%28ERLI-Net%29&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Members of the European Reference Laboratory Network for Human Influenza (ERLI-Net)</a></span>. Co-circulation of seasonal influenza A(H1N1)pdm09, A(H3N2) and B/Victoria lineage viruses with further genetic diversification, EU/EEA, 2022/23 influenza season. <a href="/content/ecdc">Euro Surveill.</a> 2024;29(39):pii=2400020. <a href="https://doi.org/10.2807/1560-7917.ES.2024.29.39.2400020" title="doi link" target="_blank">https://doi.org/10.2807/1560-7917.ES.2024.29.39.2400020</a> <span class="ES_Article_citation"> <span class="generated">Received</span>: 03 Jan 2024;&nbsp;&nbsp; <span class="generated">Accepted</span>: 17 Jun 2024 </span> </p>
/content/10.2807/1560-7917.ES.2024.29.39.2400020
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