SARS-CoV-2/human/AUS/VIC01/2020 (Caly et al., 2020) and SAR-CoV-2/B.1.1.7, provided by Public Health England, were grown in Vero (ATCC CCL-81) cells. Cells were infected with the SARS-CoV-2 virus at multiplicity of infection of 0.0001. Virus-containing supernatant was harvested when 80% CPE was observed and spun at 2000 rpm at 4°C before being stored at −80°C. Viral titers were determined by a focus-forming assay on Vero cells. Both Victoria passage 5 and B.1.1.7 stocks passage 2, were sequence verified to contain the expected spike protein sequence and no changes to the furin cleavage sites.
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