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. 2020 Oct 8;21:100442. doi: 10.1016/j.imu.2020.100442

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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. 5 — The transmission in the United States was retraceable.

(a) The original SARS-CoV-2 (GAU) and the converted (GGU) specimens collected in the United States and deposited as of 1 May 2020 (upper), and the proportion of GGU in the daily deposits (GAU + GGU). (b) The GAU and GGU specimens collected as of 22 June 2020 (upper) and their proportions. (c) Spectral analysis of the ratio trend from 28 February through 8 April in (a) and from 28 February through 21 May in (b). Periodicities (red arrow) of infection expanding within the United States were elucidated. (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)