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. 2022 Jul 22;12(8):553. doi: 10.3390/bios12080553

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© 2022 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Dose-response curves for the plasma calibrant dilution series obtained with the photonic biosensor (n = 2) in a comparison with the outcome of the relevant reference test: (A) S1/reference test: Euroimmun SARS-CoV-2 IgG-S1 ELISA (IgG) (n = 3). (B) RBD/reference test: Siemens ADVIA Centaur SARS-CoV-2 IgG (sCOVG)) (n = 2). (C) NP/reference test: Euroimmun SARS-CoV-2 IgG-NCP ELISA (n = 3). (D) NP/reference test: Abbott Architect SARS-CoV-2 IgG (n = 2). Meaning of symbols: circles = plasma (direct assay), triangles = secondary antibody (indirect assay), squares: reference test. Note: the arrow near the x-axis indicates the LOD of each indirect Surfix assay.