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Effectiveness of influenza vaccines in children aged 6 to 59 months: a test-negative case–control study at primary care and hospital level, Spain 2023/24
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View Affiliations Hide AffiliationsGloria Pérez-Gimenogloria.perez isciii.es
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Members of the SiVIRA sentinel surveillance study group: Alba Moya Garcés, Esteban Pérez, Luis García Comas, Paloma Botella Rocamora, Santiago Vicente Iglesias, Ana Ordax Díez, Lourdes Duro Gómez, Mª Olga Hidalgo Pardo, Sergio Román-Soto, Ana D. Cebollada Gracia, Ana Fernandez Ibáñez, Manuel Galán Cuesta, Ninoska López Berrios, Carlota Ruiz Porras, Irene Pedrosa Corral, Marta Pérez Abeledo, Ana S. Lameiras Azevedo, Sofía García Senso, Virginia Álvarez Río, Mª Ángel Valcárcel de Laiglesia, Jorge Reina Prieto, Francisco J. Vega-Olías, Miriam García Vázquez, Pilar Alonso Vigil, Luis J. Viloria Raymundo, Paulina V. Medel Jaime, Marcos Lozano, Lorena Vega-Piris, Silvia Galindo-CarreteroView Citation Hide Citation
Citation style for this article: . Effectiveness of influenza vaccines in children aged 6 to 59 months: a test-negative case–control study at primary care and hospital level, Spain 2023/24. Euro Surveill. 2024;29(40):pii=2400618. https://doi.org/10.2807/1560-7917.ES.2024.29.40.2400618 Received: 19 Sept 2024; Accepted: 03 Oct 2024
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Abstract
During 2023/24, all children aged 6 to 59 months were targeted for seasonal influenza vaccination in Spain nationally. Using a test-negative case–control design with sentinel surveillance data, we estimated adjusted influenza vaccine effectiveness (IVE) against any influenza type to be 70% (95% confidence interval (CI): 51 to 81%) for primary care patients with acute respiratory illness (ARI) and 77% (95% CI: 21 to 93%) for hospitalised patients with severe ARI. In primary care, where most subtyped viruses (61%; 145/237) were A(H1N1), adjusted IVE was 77% (95% CI: 56 to 88%) against A(H1N1)pdm09.
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