Screening Antibodies Raised Against the Spike Glycoprotein of SARS-CoV-2 to Support the Development of Rapid Antigen Assays
2020
The
spike glycoprotein of SARS-CoV-2 is a highly conserved surface protein and as
such may represent a good target for immunoassay detection. We screened a
variety of antibodies that were reactive to the S glycoprotein in a highly
sensitive liquid immunoassay format and also on paper-based or lateral flow
assay (LFA) to assess their analytical performance. Our findings included significant
variation in performance when using different sources of S antigen. We identified
several antibody pairs that had an LOD of below 10 pg/mL in the liquid
immunoassay format with the lowest being 3 pg/mL. The antibodies were highly
specific to SARS-Cov-2 based on cross reactivity screening with other human
CoVs. The LFA screening found some different optimal antibody pairs from the
pool of candidate antibodies used but a several antibodies were observed to have high performance with either immunoassay format.
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