SARS-CoV-2 delta variant neutralisation after heterologous ChAdOx1-S/BNT162b2 vaccination. Issue 10305 (18th September 2021) - Behrens, Georg MN; Cossmann, Anne; Stankov, Metodi V; Nehlmeier, Inga; Kempf, Amy; Hoffmann, Markus; Pöhlmann, Stefan