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. 2021 Oct 4;232:108871. doi: 10.1016/j.clim.2021.108871

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© 2021 The Authors

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 — Correlation of the concentration of surrogate nAb titre (assessed by ACE2 receptor binding inhibition assay and EliA S1-IgG methods) against neutralisation titre (assessed by cell-based, live virus neutralisation assay). Each datapoint represents one donation. A linear regression was fitted to each graph.

ACE2, angiotensin-converting enzyme 2; Ig, immunoglobulin; IgG, immunoglobulin G; MN, micro-neutralisation; nAb, neutralising antibody; r, Pearson's r correlation coefficient; S1, spike 1.