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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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Correlation plots of the Surfix photonic biosensor results versus the results obtained with each of the reference methods: (A) Euroimmun SARS-CoV-2 IgG-S1 ELISA (IgG); (B) Siemens ADVIA Centaur^® SARS-CoV-2 IgG (sCOVG) CLIA; (C) Euroimmun SARS-CoV-2 IgG-NCP ELISA; (D) Abbott Architect SARS-CoV-2 IgG CLIA. Meaning of symbols: circles = plasma (direct immunoassay), triangles = secondary antibody (indirect immunoassay).