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Assessment of reactivity of the developed SARS-CoV-2 S1 sandwich-based ELISA on RT-PCR-positive and -negative saliva samples using S1 mAbs as capture antibodies and nanobodies-conjugated gold nanoparticles (AuNPs-Nbs) as a detector antibodies. MERC-Cov and SARS-CoV antigens were used to test cross reactivity.
