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. 2021 May 2;11(5):825. doi: 10.3390/diagnostics11050825

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© 2021 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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Compairson and correlation between COVID-19 NP and S IgG ELISAs. (A) Optical density values at 450 nm (OD₄₅₀) for all negative and positive samples by MN assay using previously develpoed S-based ELISA and the NP-based ELISA protocol optimized in this study. (B) Data distribution of positive samples. Boxes: 25th to 75th percentile range; black line: median; whiskers: Min and Max. (C) OD₄₅₀ values for each sample as obtained from S- and NP-based ELISAs. (D) Non-significant correlation between S- and NP-ELISAs; r² = 0.01849, p value = 0.226.