Maurel, MarineHoward, JenniferKissling, EstherPozo, FranciscoPérez-Gimeno, GloriaBuda, SilkeSève, NoémieMcKenna, AdeleMeijer, AdamRodrigues, Ana PaulaMartínez-Baz, IvánMlinarić, IvanLatorre-Margalef, NeusTúri, GergőLazăr, MihaelaMazagatos, ClaraEcheverria, AitziberAbela, StephenBourgeois, MarcMachado, AusendaDürrwald, RalfPetrović, GorankaOroszi, BeatrixJancoriene, LigitaMarin, AlexandruHusa, PetrDuffy, RoisinDijkstra, FrederikaGallardo García, VirtudesGoerlitz, LuiseEnouf, VincentBennett, CharleneHooiveld, MariëtteGuiomar, RaquelTrobajo-Sanmartín, CaminoVišekruna Vučina, VesnaSamuelsson Hagey, ToveLameiras Azevedo, Ana SofíaCastilla, JesúsXuereb, GerdDelaere, BénédicteGómez, VerónicaTolksdorf, KristinBacci, SabrinaNicolay, NathalieKaczmarek, MarlenaRose, Angela MCEuropean IVE group2025-03-072025-03-072024-02-22Euro Surveill. 2024 Feb;29(8):2400089. doi: 10.2807/1560-7917.ES.2024.29.8.24000891560-7917http://hdl.handle.net/10400.18/10422Influenza A viruses circulated in Europe from September 2023 to January 2024, with influenza A(H1N1)pdm09 predominance. We provide interim 2023/24 influenza vaccine effectiveness (IVE) estimates from two European studies, covering 10 countries across primary care (EU-PC) and hospital (EU-H) settings. Interim IVE was higher against A(H1N1)pdm09 than A(H3N2): EU-PC influenza A(H1N1)pdm09 IVE was 53% (95% CI: 41 to 63) and 30% (95% CI: −3 to 54) against influenza A(H3N2). For EU-H, these were 44% (95% CI: 30 to 55) and 14% (95% CI: −32 to 43), respectively.engInfluenzaVaccine EffectivenessVEBISPrimary CareHospitalEuropeInvestigação em Serviços de SaúdeEstados de Saúde e de DoençaInfecções RespiratóriasCuidados de Saúdejournal article10.2807/1560-7917.ES.2024.29.8.240008938390651