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. 2021 Jul 28;27(12):1845–1850. doi: 10.1016/j.cmi.2021.07.024

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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. 2 — Values of IgG-RBD-S (a), IgM-S (b), IgG-N (c) antibodies over time, in the whole cohort. IgG-RBD-S results (a) were reported as AU/mL. IgG-N and IgM-S results were reported in an S/C index (S: sample, C: calibrator). A logarithmic scale (log 10) was used to report the results in the figure.