Huh7 and Vero E6 cells were grown at 37°C and 5% CO2 in Dulbecco’s modified Eagle’s medium (DMEM) (Sigma-Aldrich, St. Louis, MO) containing 10% fetal bovine serum (FBS) (Wisent Inc., St. Bruno, Canada), 2 mM l-glutamine (Thermo Fisher Scientific, Waltham, MA), 50 U/mL penicillin (Thermo Fisher Scientific), and 50 μg/mL streptomycin (Thermo Fisher Scientific). BHK-T7 (baby hamster kidney) cells expressing T7 polymerase were grown at 37°C and 5% CO2 in minimum essential medium (Thermo Fisher Scientific) containing 10% tryptose phosphate broth (Thermo Fisher Scientific), 5% FBS, 2 mM l-glutamine, 50 U/ml penicillin, and 50 μg/mL streptomycin. SARS-CoV-2 isolate nCoV-WA1-2020 (GenBank accession number MN985325.1) (57) was used for the animal challenge studies and neutralization test.
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