approach(9) SARS-CoV-2(9) COVID-19(8) streptavidin(6) antibody(6) biotinylated(6) immunoassay(6) Immunoglobulin(6) IgM and IgA antibodies(6) IgA antibodies(6) anti-IgG(6) IgG(6) condition(6) nucleocapsid protein(6) Immunoglobulin G(6) multiplex(6) Flow(6) secondary antibodies(6) flow cytometric(6) Diagnosis(6) CBA(6) sensitivity(6) anti-SARS-CoV-2 IgG(6) multiplex immunoassay.(6) positive(6) anti-IgM(6) IgM(6) were used(6) Protein(6) SARS-CoV-2 antibodies(6)