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. 2021 Feb 13;33(3):101366. doi: 10.1016/j.jksus.2021.101366

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© 2021 The Author(s)

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 — The overall seroprevalence rate of anti-SARS-CoV-2 IgG antibody among healthcare workers by ELISAs. (A) Results obtained from in-house ELISA. The means and standard deviations of optical density values at 450 nm (OD₄₅₀) are shown. The cut-off value of the assay is 0.27. (B) Results obtained from Elecsys® test system. The antibody titer for each sample is shown. The cut-off value of the assay is ≥ 1. (C) The numbers of positive (blue) and negative (black) samples obtained from in-house ELISA and Elecsys® test system.