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SARS-CoV-2 nucleocapsid (N) antigen expression assay. Immunofluorescence staining of SARS-CoV-2-N antigens (labelled with in-house rabbit antiserum against SARS-CoV-2-N in green) and cell nuclei (labelled with 4′,6-diamidino-2-phenylindole in blue). Fixation and staining was performed after each recombinant IFN (3000 IU/mL) or antiviral agent (20 µM) was used to treat the SARS-CoV-2-infected compound (multiplicity of infection = 0.1) VeroE6 cells for 24 h. Scale bar = 100 µm.
