SARS-CoV-2 (WIV04) [18] was passaged in Vero E6 cells and titered by a plaque assay. Vero E6 cells were treated with drugs at the indicated concentrations and exposed to SARS-CoV-2 virus at an MOI of 0.01. Cells cocultured with virus were maintained in DMEM with 2% FBS, and the supernatants were collected at 24 h post infection. Magnetic Bead Virus RNA Extraction Kits (Shanghai Fine Gene Biotech, FG438) were used for viral RNA extraction. Viral RNA was quantified by real-time RT-PCR with TaqMan probes targeting the RBD2 gene.
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