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. 2020 Jul 17;130:104549. doi: 10.1016/j.jcv.2020.104549

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© 2020 Elsevier B.V. All rights reserved.

Since January 2020 Elsevier has created a COVID-19 resource centre with free information in English and Mandarin on the novel coronavirus COVID-19. The COVID-19 resource centre is hosted on Elsevier Connect, the company's public news and information website. Elsevier hereby grants permission to make all its COVID-19-related research that is available on the COVID-19 resource centre - including this research content - immediately available in PubMed Central and other publicly funded repositories, such as the WHO COVID database with rights for unrestricted research re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for free by Elsevier for as long as the COVID-19 resource centre remains active.

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Fig. 2 — Correlation between SARS-CoV-2 serology assays.

A Scatter plots with logarithmic scales, each displaying the correlation between two tests. Test results of SARS-CoV-2 PCR positive patients (n = 75) are plotted. Each dot represents one sample. Dotted lines indicate assay cut-offs for positivity (upper line) and borderline test results (lower line). Values in dark blue areas tested positive in both assays and values in light blue areas in one assay. B Person correlation coefficients (r²) arranged in the same format as in A. Values are color-coded, with values close to 1 displayed in a dark blue and values close to 0 in a light blue. All correlations are significant (p-value: ≤0.0003).

Abbreviations: A/C.O., absorbance/cut-off value; AU/ml, arbitrary units/mL; COI, cut-off index (signal sample/cut-off); D, Diasorin; E, Euroimmun; R, Roche; Ratio, ratio (extinction sample/extinction calibrator); S, Siemens; W, Wantai.