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. 2021 Jan 18;27(6):808–813. doi: 10.1016/j.jiac.2021.01.006

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© 2021 Japanese Society of Chemotherapy and The Japanese Association for 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 — Changes in IgG antibody titer levels in the 84 participants, according to sex, diabetes mellitus (DM) status, and C-reactive protein (CRP) levels during COVID-19. Antibody titers were highest in the first 5 or 6 weeks after the onset of the disease and then decreased gradually. Antibody titers tended to be higher in males, participants with DM, and those with high values of maximum CRP levels during the acute phase.