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. 2022 Feb 24;236:108959. doi: 10.1016/j.clim.2022.108959

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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 — SARS-CoV-2 elicited anti-spike IgM and anti-nucleocapsid IgG antibody responses following symptom onset related to viral antigen detection and viral load. A and B, scatterplots with solid lines showing 10 day moving average of antibody index values. C and D, scatterplots with solid line indicating RT-PCR cycle threshold of 27.5 (Cepheid platform) above which virtually all patients were antigen negative and most seropositive.