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. 2020 Oct 14;755:142939. doi: 10.1016/j.scitotenv.2020.142939

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© 2020 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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Fig. 3 — Internal and external references for comparing virus levels between methods and samples. A. PMMoV detection normalized to input and recovery rate of spiked BCoV. B. SARS-CoV-2 N gene detection normalized to input and internal PMMoV reference. C. SARS-CoV-2 N gene detection normalized to input and recovery rate of spiked BCoV. Student's t-test were used to calculate statistical significance (*p < 0.05, **p > 0.01, ***p < 0.001).