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. 2003 Oct 10;21(27):4095–4104. doi: 10.1016/S0264-410X(03)00489-4

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Copyright © 2003 Elsevier Ltd. All rights reserved.

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. 1 — Coronavirus classification (reprinted with permission from The Lancet 2003, 361 (9371), 1779–1785 [7]). The Coronaviridae family contains the genuses coronavirus and torovirus. The genus coronavirus is broken down into three groups. SARS-CoV has been assigned to a fourth group. Group 1 includes canine coronavirus (CCV), feline coronavirus (FIPV), human coronavirus 229E (HCoV-229E), porcine epidemic diarrhea virus (PEDV) and transmissible gastroenteritis virus (TEGV). Group 2 species are bovine coronavirus (BCoV), human coronavirus OC43 (HCoV-OC43), murine hepatitis virus (MHV), porcine hemagglutinating encephalomyelitis virus (HEV) and rat coronavirus (RCV). Group 3 species are avian infectious bronchitis virus (IBV) and Turkey corona-virus (TCoV).