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. 2021 Apr 20;101(2):115387. doi: 10.1016/j.diagmicrobio.2021.115387

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© 2021 Published by Elsevier Inc.

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 — Association of repeat C_T values in unique patients and the time between results. Repeat XY plot showing the EM/RGQ ΔC_T (C_T₁-C_T₂) as a function of days elapsed between the two tests for patients who consecutively tested positive for SARS-CoV-2. A negative ΔC_T value indicates a decrease in viral load between tests.