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. 2021 Feb 11;105:83–90. doi: 10.1016/j.ijid.2021.02.009

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© 2021 The Author(s)

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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Cycle threshold values (Ct) in nasopharyngeal swab versus saliva. (A) RNAse P gene in all samples; (B) N1 in SARS-CoV-2-positive samples; (C) N2 in SARS-CoV-2-positive samples. RNAse P had a significantly higher concentration of total RNA in saliva compared to nasopharyngeal swab; p < 0.00001 (t-test).