ABSTRACT Measuring the antibody response to 2019 SARS CoV2 is critical for diagnostic purposes, for monitoring the prevalence of infection, and for gauging the efficacy of the worldwide vaccination effort for COVID-19. In this study, a microchip-based grating-coupled fluorescent plasmonic (GC-FP) assay was used to measure antibody levels that resulted from COVID-19 infection and vaccination. In addition, we measured the relative antibody binding toward antigens from the CoV2 virus variants strains B.1.1.7 (Alpha) and B.1.351 (Beta). Antibody levels against multiple antigens within the SARS CoV2 spike protein were significantly elevated for both vaccinated and infected individuals, while those against the nucleocapsid (N) protein were only elevated for infected individuals. GC-FP was effective for monitoring the IgG-based serological response to vaccination throughout the vaccination sequence and also resolved acute (within hours) increases in antibody levels. A significant decrease in antibody binding to antigens from the B.1.351 variant, but not B.1.1.7, was observed for all vaccinated subjects when measured by GC-FP compared to the 2019 SARS CoV2 antigens. These results were corroborated by competitive enzyme-linked immunosorbent assay (ELISA). Collectively, the findings suggest that GC-FP is a viable, rapid, and accurate method for measuring both overall antibody levels to SARS CoV2 and relative antibody binding to viral variants during infection or vaccination. IMPORTANCE In this work, a novel biosensor technology was used to measure antibody levels that resulted from vaccination against COVID-19 and/or from infection with the virus. Importantly, this approach enables quantification of antibody levels, which can provide information about the timing and level of immune response. Due the multiplexed nature of this approach, antibody binding to both the original 2019 SARS CoV-2 strain and variant strains can be performed simultaneously and in a short (30-min) time frame.
【저자키워드】 COVID-19, Vaccine, antibody, variant, diagnostic, detection, biosensor, plasmonic, multiplex, Quantitative, CoV2, 【초록키워드】 SARS CoV-2, Efficacy, immune response, vaccination, B.1.351, Infection, virus, ELISA, Spike protein, Antigen, Prevalence, Protein, Antibody binding, COVID-19 infection, B.1.1.7, nucleocapsid, antigens, Beta, information, quantification, viral variant, Critical, antibody level, serological response, strain, Frame, subject, B.1.351 variant, infected individuals, sequence, effort, significant decrease, fluorescent, approach, vaccination against COVID-19, effective, enzyme-linked immunosorbent, performed, was used, significantly, addition, elevated, resolved, the antibody response, increases in, multiple antigen, the timing, virus variant, 【제목키워드】 Human, Rapid, novel, Result,