Detection of nucleoproteins (NP) derived from SARS-CoV-2 (S), Influenza A virus (A), and Influenza B virus (B) by lateral flow assay using the monoclonal antibody pair. “C” stands for control. Pair for S : Capture : SARS-CoV-2 (COVID-19) Nucleocapsid antibody [HL455] (GTX635688) Detection : SARS-CoV-2 (COVID-19) Nucleocapsid antibody [HL5511] (GTX635689) Pair for A: Capture : Influenza A virus Nucleoprotein antibody [HL1952] (GTX637789) Detection : Influenza A virus Nucleoprotein antibody [HL1078] (GTX636199) Pair for B : Capture : Influenza B virus Nucleoprotein antibody [HL1073] (GTX636194) Detection : Influenza B virus Nucleoprotein antibody [HL1068] (GTX636099) Samples (40 ng) : 1. Lysis buffer 2. Mixture of SARS-CoV-2 (GTX135592-pro), Flu A-H1N1 (GTX135904-pro), and Flu B Nucleoprotein (GTX135867-pro)