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Test results of the reactivity of three different concentrations ((A) 5 µg/mL, (B) 2.5 µg/mL and (C) 1.25 µg/mL) of both SARS-CoV-2 S1 (RBD) nanobodies conjugated with gold nanoparticles (AuNPs-Nbs) and free nanobodies against different concentrations of recombinant SARS-CoV-2 S1 antigen. * represents significant difference (p < 0.000) as compared with the corresponding AuNPs-Nbs at each antigen concentration. Each bar represents mean ± standard error of the mean.
