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. 2020 Dec 29;176:112920. doi: 10.1016/j.bios.2020.112920

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Fig. 3 — The qualitative serological detection of the anti-SARS-CoV-2 nucleoprotein using the two-step RF-ELISA. (A) The schematics of the main steps for the detection. The qualitative detection of (B) PBS blank and serum 1–3; (C) PBS blank, serum 1 and serum 4–5; (D) serum 1 and serum 6–7; (E) serum 1 and serum 8–10; (F) serum 1 and serum 11–13. Upper: the images of the chips displaying colorimetric results, below: the images of the selected sites and its concentration-dependent responses in gray level. (G) The comparison of qualitative results taken from our presented RF-ELISA (upper) and conventional static ELISA performed in FAH-SYSU (below), respectively.