Data was downloaded as an Excel spreadsheet which appeared in the Public Use Datasets section under the Cumulative Data link of Michigan's Coronavirus webpage, under the url https://www.michigan.gov/coronavirus/0,9753,7-406-98163_98173---,00.html.
Cases are aggregated by the date of onset of COVID-19 symptoms, if known, otherwise by laboratory specimen date if known, otherwise by case referral date. Deaths are aggregated by the date of death if known, otherwise by the last date of a change to the case status.
WMU ScholarWorks Citation
Michigan Department of Health & Human Services, "2021-09-20_MichiganOverview_COVIDcounts.pdf" (2021). Michigan COVID-19 Confirmed Cases by Date of Onset Data. 115.