CAD and infection: After Vero E6 cells were treated with CPs at the final concentration range from 0.006 μg/mL to 500 μg/mL (serially diluted 1/5), the cells were infected with 1.5 × 104 TCID50/mL of SARS-CoV-2 virus at a multiplicity of infection (MOI) of 0.02.