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. 2021 Aug 19:1–7. doi: 10.1017/S1047951121003693

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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 subject to 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 2. — The distribution of the number of months between the time at which the cases had Covid-19 and when the study was conducted according to the presence of symptoms at the time of the study.