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. 2021 Apr 2;49(9):1129–1135. doi: 10.1016/j.ajic.2021.03.020

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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: — Criteria for inclusion in description of a COVID-19 outbreak in one of the largest jails in the United States—Cook County, IL, March 1–April 30, 2020

Abbreviations: CCSO, Cook County Sheriff's Office; CCJ, Cook County Jail; PCR, polymerase chain reaction assay; SARS-CoV-2, severe acute respiratory syndrome coronavirus 2.

The average detained person census during the study period was 4,884; the average number of staff on site daily was approximately 1,500. Among 1,256 detained persons and 289 staff with detained person contact epidemiologically linked to CCJ, 479 symptomatic detained persons, 149 asymptomatic detained persons, and 279 symptomatic staff were PCR-positive for SARS-CoV-2 and included in analyses. Self-reported positive SARS-CoV-2 test results by staff were confirmed using the Illinois National Notifiable Disease Surveillance System.