Acknowledgments. The contributions of the entire Global Pathogen Safety team, most notably Simone Knotzer, Melanie Graf, Jasmin de Silva, Julius Segui (neutralization assays), Veronika Sulzer, Sabrina Brandtner (cell culture), as well as Eva Ha and Alexandra Schlapschy-Danzinger (virus culture) are gratefully acknowledged. The team of Plasma Analytics, Takeda, Vienna prepared the human plasma pool samples. SARS-CoV-2 was sourced via EVAg (supported by the European Community) and kindly provided by Christian Drosten and Victor Corman (Charité Universitätsmedizin, Institute of Virology, Berlin, Germany).