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All US counties (n=3091) with at least 50 confirmed COVID-19 cases and greater than 4 weeks of follow-up data were included in the analysis. Data were analysed for a period of 50 weeks starting from 22 March 2020 to 6 March 2021.
Copyright and License information: ©2021 Author(s) (or their employer(s)) 2021. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.
This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.
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