Marine Maurel, Clara Mazagatos, Luise Goerlitz, Beatrix Oroszi, Mariette Hooiveld, Ausenda Machado, Lisa Domegan, Maja Ilić, Rodica Popescu, Noémie Sève, Iván Martínez-Baz, Amparo Larrauri, Silke Buda, Gergő Túri, Adam Meijer, Verónica Gomez, Joan O'Donnell, Ivan Mlinarić, Olivia Timnea, Ana Ordax Diez, Ralf Dürrwald, Judit Krisztina Horváth, Frederika Dijkstra, Ana Paula Rodrigues, Adele McKenna, Sanja Kurečić Filipović, Mihaela Lazar, Marlena Kaczmarek, Sabrina Bacci, Esther Kissling
BACKGROUND: Within influenza vaccine effectiveness (VE) studies at primary care level with a laboratory-confirmed outcome, clinical case definitions for recruitment of patients can vary. We used the 2022-23 VEBIS primary care European multicentre study end-of-season data to evaluate whether the clinical case definition affected IVE estimates. METHODS: We estimated VE using a multicentre test-negative case-control design. We measured VE against any influenza and influenza (sub)types, by age group (0-14, 15-64, ≥65 years) and by influenza vaccine target group, using logistic regression...
May 3, 2024: Vaccine