Seroprevalence of IgG antibodies against SARS-CoV-2 – a serial prospective cross-sectional nationwide study of residual samples, Belgium, March to October 2020 Herzog, Sereina Annik and De Bie, Jessie and Abrams, Steven and Wouters, Ine and Ekinci, Esra and Patteet, Lisbeth and Coppens, Astrid and De Spiegeleer, Sandy and Beutels, Philippe and Van Damme, Pierre and Hens, Niel and Theeten, Heidi, Eurosurveillance, 27, 2100419 (2022), https://doi.org/10.2807/1560-7917.ES.2022.27.9.2100419