2026-04-29T02:37:53Zhttps://repisalud.isciii.es/rest/oai/request

oai:repisalud.isciii.es:20.500.12105/266022025-12-18T13:01:23Zcom_20.500.12105_2052com_20.500.12105_2051col_20.500.12105_19609

00925njm 22002777a 4500 dc Broberg, Eeva K author Svartström, Olov author Riess, Maximilian author Kraus, Annette author Vukovikj, Maja author Melidou, Angeliki author European Reference Laboratory Network for Human Influenza (ERLI-Net) author Pozo Sanchez, Francisco author Casas Flecha, Inmaculada author 2024-09 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. Broberg EK, Svartström O, Riess M, Kraus A, Vukovikj M, Melidou A; Members of the European Reference Laboratory Network for Human Influenza (ERLI-Net); Collaborators. 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. Euro Surveill. 2024 Sep;29(39):2400020. 1025-496X https://hdl.handle.net/20.500.12105/26602 39328158 10.2807/1560-7917.ES.2024.29.39.2400020 1560-7917 Euro surveillance : bulletin Européen sur les maladies transmissibles = European communicable disease bulletin Europe Characterisation Genetic Influenza virus Sequencing Surveillance 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