The daily summary was obtained from Michigan's main COVID-19 page: https://www.michigan.gov/coronavirus. Data was compiled by the Michigan Department of Health and Human Services (MDHHS). The information was updated daily at 2p.m., with yesterday's COVID-19 positive results as of midnight.
The image shows the table "Daily Confirmed COVID-19 Cases by County", which provided statistics on daily cases and deaths in each Michigan county. The City of Detroit and Wayne County were reported separately.
WMU ScholarWorks Citation
Michigan Department of Health & Human Services, "2020-03-18_MichiganDaily_COVIDdata_update" (2020). Daily Michigan COVID-19 Update. 432.