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. 2020 Sep 3;169:112572. doi: 10.1016/j.bios.2020.112572

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Fig. 2 — Affinity screening of the calibration antibodies. (A) Calibration curves of 4 different monoclonal humanized S1 specific IgG against the S1 protein from SARS-CoV-2. (B) Calibration curves of 4 different monoclonal humanized S1 specific IgG against the S1 protein from SARS-CoV (B). The solid lines are the linear fit of the data in the log-log scale. D006 is the only antibody that has a high affinity and high specificity towards SARS-CoV-2 S1. Illustration of the assay mechanism, which uses a single-step ELISA format, is shown in Fig. 1(A). The sample-to-answer time of this assay is 8 min.