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. 2021 Jul 22;142:104931. doi: 10.1016/j.jcv.2021.104931

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© 2021 The Authors. Published by Elsevier B.V.

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 3 — A: Overall percentage agreement between all tests and against the gold standard RT-PCR. B: Overall positive percentage agreement at > 15 days post-symptom onset between all tests and against the gold standard RT-PCR C: Overall negative percentage agreement between all tests and against the gold standard RT-PCR.