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. 2021 Oct 10;102(4):115573. doi: 10.1016/j.diagmicrobio.2021.115573

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© 2021 The Authors

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 — Quantitative anti-spike IgG at the different time points in the cohort study (n = 50). (A) Comparison between individuals in the CoV2- and CoV2+ groups. (B-E) Antibody kinetics between less than and more than 60 years old individuals in the 2 previous groups, CoV2- and CoV2+, respectively. The horizontal black solid lines indicate median anti-spike IgGs in each cohort. Statistically significant (P < 0.05) differences between paired results are added in the figure.