The Michigan COVID-19 Confirmed Cases by Date of Onset Data is a collection released by local government in the state of Michigan.

Between 2020-04-08 and 2020-06-04, data was captured from the Cumulative Data link of Michigan's Coronavirus webpage, under the url https://www.michigan.gov/coronavirus/0,9753,7-406-98163_98173_99207---,00.html. From 2021-06-05 onward, this data began appearing as a downloadable public use dataset under the dashboard. However, this dataset was not downloaded regularly until 2020-08-23, which is why there is a gap between the dates.
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.

On 2023-04-10, President Biden ended the U.S. National Emergency Response to COVID-19, and on 2023-05-11, the Public Health Emergency Order expired. Due to the impending changes in reporting, this collection will no longer be updated past the end of April 2023. A zipped file of all the collection documents between 2020-04-08 and 2023-04-26 and their aggregated metadata is available for download at https://scholarworks.wmich.edu/michigan-covid-data-state-counts/195/.

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