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. 2023 May 10;41(26):3923–3929. doi: 10.1016/j.vaccine.2023.05.022

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© 2023 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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Fig. 1 — Relative difference in per-week testing activity among health care workers (HCW) compared to non-HCW during the Delta (31 July-12 November 2021) and Omicron (3–30 January 2022) waves. Dashed line is the average relative testing difference for the Delta and Omicron wave, respectively.