Fig. 4.

The plot of change in the fluorescence of FITC-Ahx-H-d-(Dabcyl)peptide substrate against the various concentrations of Covid-19 live virus ( 10⁸–10 pfu/mL) after 3 hours of incubation at 37°C. The samples were excited at 485 nm and the fluorescence was observed at 535 nm. The standard errors were calculated from the three different measurements