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. 2020 Sep 6;26(12):1690.e1–1690.e4. doi: 10.1016/j.cmi.2020.08.043

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© 2020 Published by Elsevier Ltd on behalf of European Society of Clinical Microbiology and Infectious Diseases.

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 — Kinetics of IgA (A), Ig M (B), Ig G (C) and neutralizing antibodies (D) to SARS-CoV-2 over time in 35 COVID-19 cases. The dashed curve draws with experiential growth model and indicates the dynamic tendency of antibodies. Each dot of ELISA presents as mean and standard deviation, and titres of neutralizing antibodies present geometric mean and standard deviation. Purple symbols denote severe cases, and cyan symbols denote mild cases.