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). Test results were updated daily, typically in the evening. Testing data included in the chart reflected COVID-19 tests conducted by the MDHHS Bureau of Laboratories. Any additional testing underway by private lab companies was not reflected.
The image shows a table which provided statistics on the COVID-19 situation within Michigan. It included the variables Meets PUI Criteria: Testing Approved, Negative for 2019-nCoV, Positive for 2019-nCoV, Test Results Pending, Referred for Assessment and/or Monitoring to Date, Total Assessment and-or Monitoring Referrals Under Active Monitoring.
"Referred for Assessment/Monitoring" includes referrals from CDC airport quarantine stations, self-referrals, close contacts of pending persons under investigation (PUIs) and healthcare provider referrals entered by local health departments
WMU ScholarWorks Citation
Michigan Department of Health & Human Services, "2020-03-13_MichiganDaily_COVIDdata" (2020). Daily Michigan COVID-19 Update. 425.