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. 2021 May 8;27(9):1349.e1–1349.e6. doi: 10.1016/j.cmi.2021.05.008

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© 2021 European Society of Clinical Microbiology and Infectious Diseases. Published by Elsevier Ltd.

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 — Violin chart presentation (median and 25–75 IQR) of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) IgG antibody levels plotted against the time (months) since positive coronavirus disease 2019 (COVID-19) nasopharyngeal swab. (A) All subjects. Population stratified by: (B) age (>50 years, n = 70; ≤50 years, n = 318); (C) gender (females n = 108; males n = 284); and (D) clinical symptomatology (symptomatic, n = 358; asymptomatic, n = 34). The plots show the medians (middle line) and the first and third quartiles (boxes).