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COVID-19 vaccine effectiveness against symptomatic infection with SARS-CoV-2 BA...

Lanièce Delaunay, Charlotte; Martínez-Baz, Iván; Sève, Noémie; Domegan, Lisa; Mazagatos, Clara; Buda, Silke; Meijer, Adam; Kislaya, Irina

Background: Scarce European data in early 2021 suggested lower vaccine effectiveness (VE) against SARS-CoV-2 Omicron lineages than previous variants. Aim: We aimed to estimate primary series (PS) and first booster VE against symptomatic BA.1/BA.2 infection and investigate potential biases. Methods: This European test-negative multicentre study tested primary care patients with acute respiratory symptoms for SAR...


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