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. 2022 Jun 22;122:420–426. doi: 10.1016/j.ijid.2022.06.028

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© 2022 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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Characteristics of vaccinated and nonvaccinated patients with SARS-CoV-2 infection in the three study periods. (A) Number of patients in the different age groups. (B) Rate of patients with concomitant chronic medical conditions. (C) Rate of patients requiring admission to the intensive care unit (ICU). Prevaccination: October 15, 2020-November 15, 2020; Delta: October 15, 2021-November 15, 2021; Omicron: December 15, 2021-January 15, 2022.