Antiviral activity of remdesivir (A), lopinavir (B), homorringtonine (C) and emetine dihydrochloride (D) against SARS-CoV-2 virus in vitro. Infectious viral loads (log10TCID50/mL left Y axis) and viability (normalized to the ATP level of the Vero E6 cells incubated with infection media) under increasing concentrations of the antiviral compounds are shown.