Time-resolved fluoroimmunoassay.(2) Hepatitis B e antigen(2) Dual-label(2) Hepatitis B virus surface antigen(2) Synchronous.(1) Organic dyes.(1) Image cytometry(1) plasma(1) Bio-conjugated sensor(1) SARS-CoV-2(1) Remdesivir(1) Complementary DNA(1) COVID-19(1) Celigo(1) Spectrofluorometric(1) COVID -19 Virus(1) Antiviral(1) Favipiravir(1) fluorescence resonance energy transfer(1) Drug repurposing(1)