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. 2020 Aug 8;484:112832. doi: 10.1016/j.jim.2020.112832

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© 2020 Published by Elsevier B.V.

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. 8 — Limit of detection. Known negative samples were run against SARS-CoV-2-RBD for IgG, IgA and IgM. The graph shows 90 negative samples for all three isotypes, the limit of detection (lines of corresponding colors) and the percentage of data point under the limit of detection. High, medium and low positive samples were also plotted to show the range in contrast to the limit of detection.