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. 2022 Jan;61(1):22–25. doi: 10.1177/00099228211044842

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© The Author(s) 2021

This article is made available via the PMC Open Access Subset for unrestricted re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for the duration of the COVID-19 pandemic or until permissions are revoked in writing. Upon expiration of these permissions, PMC is granted a perpetual license to make this article available via PMC and Europe PMC, consistent with existing copyright protections.

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Figure 1. — The number of respiratory infections by week in 2019 compared with 2020. The asterisk denotes the time when coronavirus disease 2019 restrictions were begun.