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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. 5 — Optimization of detecting antibody dilution. With high (H), medium (M) and low (L) samples, four different dilutions of detecting antibody were tested for IgG (A), IgA (B) and IgM (C). Optimal dilutions are shown in red. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)