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. 2022 Apr 26;121:58–65. doi: 10.1016/j.ijid.2022.04.042

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© 2022 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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Linear regression of quantitative testing of specific IgG or NAb specific to SARS-CoV-2 in blood samples from COVID-19 patients using the QD-LFIA. (A) Linear regression curves for IgG titers in diluted standard samples. The IC50 of standard sample with 1:1 (B) and 1:30 (C) dilution were tested by pVNT. (D) Representative fluorescent images of reactive C, T1, and T2 lines in diluted standard samples.