Melidou, AngelikiPereyaslov, DmitriyHungnes, OlavProsenc, KatarinaAlm, ErikAdlhoch, CorneliaFielding, JamesSneiderman, MiriamMartinuka, OksanaCelentano, Lucia PastorePebody, RichardWHO European RegionPozo Sanchez, FranciscoCasas Flecha, InmaculadaEuropean Influenza Surveillance Network (EISN)2022-09-022022-09-022020-11Euro Surveill. 2020 Nov;25(46):2001822.http://hdl.handle.net/20.500.12105/14935The COVID-19 pandemic negatively impacted the 2019/20 WHO European Region influenza surveillance. Compared with previous 4-year averages, antigenic and genetic characterisations decreased by 17% (3,140 vs 2,601) and 24% (4,474 vs 3,403). Of subtyped influenza A viruses, 56% (26,477/47,357) were A(H1)pdm09, 44% (20,880/47,357) A(H3). Of characterised B viruses, 98% (4,585/4,679) were B/Victoria. Considerable numbers of viruses antigenically differed from northern hemisphere vaccine components. In 2020/21, maintaining influenza virological surveillance, while supporting SARS-CoV-2 surveillance is crucial.engVoRhttp://creativecommons.org/licenses/by/4.0/COVID-19EuropeSARS-CoV-2Influenza virusPandemicSurveillanceVirus characterizationEpidemiological MonitoringAntigens, ViralBetacoronavirusCOVID-19Coronavirus InfectionsDisease NotificationHumansInfluenza A Virus, H1N1 SubtypeInfluenza A Virus, H3N2 SubtypeInfluenza A virusInfluenza B virusInfluenza, HumanPandemicsPneumonia, ViralPopulation SurveillanceRNA, ViralSARS-CoV-2Sequence Analysis, DNAAtribución 4.0 Internacional332136832546200182210.2807/1560-7917.ES.2020.25.46.20018221560-7917Euro Surveillance : bulletin Europeen sur les maladies transmissibles = European communicable disease bulletinopen access