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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. 1 — Test results of examined SARS-CoV-2 serology assays.

A-E The scatter plots with logarithmic scales display test results of SARS-CoV-2 PCR positive patients (blue dots, n = 75) and pre-pandemic blood donors (green dots, n = 320). Each dot represents one sample. Cut-off values for positivity are 1.1 for Euroimmun, 15 for Diasorin and 1 for Roche, Wantai and Siemens (upper dotted line). Cut-off values for borderline test results are 0.8 for Euroimmun and 12 for Diasorin (lower dotted line). F Test results of SARS-CoV-2 PCR positive patients (n = 75). Each column represents one patient. Samples are sorted by time since onset of symptoms in days. Negative test results are displayed in grey, positive test results in blue and borderline test results in light blue. Immunosuppressed patients are marked by a * in the bottom row and a ↑ in the bottom row indicates that RT-PCR was performed by an external certified lab.

Abbreviations: A/C.O., absorbance/cut-off value; AU/mL, arbitrary units/mL; COI, cut-off index (signal sample/cut-off); d, days; Dia, Diasorin; Eur, Euroimmun; Roc, Roche; Ratio, ratio (extinction sample/extinction calibrator); Sie, Siemens; Wan, Wantai.