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. 2021 Jan 13;28(30):40424–40430. doi: 10.1007/s11356-021-12364-4

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© This is a U.S. government work and not under copyright protection in the U.S.; foreign copyright protection may apply 2021

This article is made available via the PMC Open Access Subset for unrestricted research re-use and secondary analysis in any form or by any means with acknowledgement of the original source. These permissions are granted for the duration of the World Health Organization (WHO) declaration of COVID-19 as a global pandemic.

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Fig. 2 — Population density and morbidity in 53 locations in the USA and its territories. a Population density in the 53 locations in the US states and territories. The number on vertical axis is the average number of persons per kilometer. Names of the states and territories are listed on the horizontal axis. b Disease morbidity rate in the 53 in the US states and territories. The number on vertical axis is the average rate of morbidity from COVID-19. Names of the states and territories are listed on the horizontal axis. c The relationship between the population density and disease morbidity. The number on vertical axis is the disease morbidity rate, and the horizontal axis is the number of persons per kilometer