Age-related prevalence of cross-reactive antibodies against influenza A(H3N2) variant virus, Germany, 2003 to 2010 Blümel, B and Schweiger, B and Dehnert, M and Buda, S and Reuss, A and Czogiel, I and Kamtsiuris, P and Schlaud, M and Poethko-Müller, C and Thamm, M and Haas, W, Eurosurveillance, 20, 21206 (2015), https://doi.org/10.2807/1560-7917.ES2015.20.32.21206