Monday, March 29, coronavirus data by Michigan county: Macomb, Genesee among 13 counties now above 15% positivity rate



Michigan now has 13 of its 83 counties with a positive rate of over 15% on average over seven days on coronavirus diagnostic tests.

These counties include Macomb, Genesee, Lapeer and St. Clair.

6 reasons Michigan’s COVID-19 numbers are rising

Statewide, the seven-day positivity rate on coronavirus diagnostic tests fell from 7.4% to 10.6% in the past week. The one-day rate was 11.8% for test results reported on Saturday.

The seven-day average of new daily cases fell from 2,482 to 3,965 over the past week.

Below is a more in-depth look at the county-level data, based on two of the metrics used by the Michigan Department of Health and Human Services.

First, a look at the seven-day average positivity rates by county, grouped by state metric.

  • Level E (over 20%) eight counties: Huron, Sanilac, Otsego, St. Clair, Lapeer, Tuscola, Missaukee and Oscoda.
  • Level D (15-20%), five counties: Wexford, Macomb, Roscommon, Genesee and Crawford.
  • Level C (10-15%), 33 counties from highest to lowest: Hillsdale, Kalkaska, Allegan, Osceola, Eaton, Van Buren, Jackson, Antrim, Kalamazoo, Oceana, Ottawa, St Joseph, Presque Isle, Wayne, Ingham , Livingston, Barry, Clinton, Iosco, Bay, Monroe, Cass, Oakland, Muskegon, Shiawassee, Calhoun, Cheboygan, Montcalm, Newaygo, Saginaw, Berrien, Ontonagon and Lake.
  • Level B (7-10%): 17 counties, from highest to lowest: Kent, Gladwin, Mecosta, Grand Traverse, Midland, Lenawee, Branch, Leelanau, Benzie, Alcona, Arenac, Mason, Montmorency, Emmet, Alpena, Keweenaw and Ionia.
  • Level A (3-7%): 14 counties, from highest to lowest: Houghton, Manistee, Isabella, Clare, Mackinac, Ogemaw, Charlevoix, Dickinson, Gogebic, Delta, Gratiot, Chippewa, Marquette and Washtenaw,
  • Low (less than 3%): six counties, from highest to lowest: Luce, Iron, Menominee, Algiers, Baraga and Schoolcraft.

The graph below lets you search any county by name to see the seven-day average positivity rate from March 20 to 26. The graph compares the average of the last seven days to the average of the previous week.

The interactive map below shows the seven-day average testing rate by county. You can hover your cursor over a county to see the underlying data.

New cases per capita

Another metric used by the Michigan Department of Health and Human Services to access coronavirus risk is daily new cases per capita.

This measure calculates the average number of new cases per 1 million inhabitants.

Levels for each county:

  • Level E (over 150 cases per million): 65 counties, highest to lowest: Huron, Sanilac, St. Clair, Missaukee, Otsego, Macomb, Lapeer, Wexford, Jackson, Tuscola, Antrim, Oakland, Roscommon, Osceola , Eaton, Wayne, Livingston, Crawford, Genesee, Ingham, Bay, Kalkaska, Oscoda, Ottawa, Calhou, Montcalm, Cass, Kalamazoo, Midland, Shiawassee, Allegan, Monroe, Newaygo, Kent, Barry, Clinton, Presque Isle, Berrien, Cheboygan, Grand Traverse, Gladwin, Washtenaw, Van Buren, Saginaw, Mecosta, Hillsdale, Ionia, Lenawee, Chippewa, Ocean, Iosco, Lac, Mason, St. Joseph, Alcona, Houghton, Branche, Emmet, Leelanau, Isabella, Manistee, Clare, Muskegon, Alpena, Benzie and Gratiot.
  • Level D (70 to 149 cases per million): 15 counties: Arenac, Charlevoix, Keweenaw, Delta, Ontonagon, Mackinac, Dickinson, Ogemaw, Marquette, Baraga, Gogebic, Montmorency, Schoolcraft and Menominee.
  • Level C (40 to 69 cases per million): Luce and Iron.
  • Level B (20 to 40 cases per million): Algiers
  • Level A (7 to 20 cases per million): None.
  • Low (less than 7 cases per million): none.

Here is an online database that allows readers to see the number of new coronavirus cases in the past seven days compared to the previous week, as well as the number per capita that adjusts for the population. The arrows indicate whether the total number of new cases reported in the last seven days has increased or decreased compared to the previous seven days.

Current scores are based on new cases reported from March 21 to 27. The map below is shaded based on the six levels of state. Arrows indicate whether the total number of new cases reported in the past seven days has increased or decreased from March 14-20.

Readers can hover their cursor over a county to see the underlying data. (Tip: you can drag the map with your cursor to see the entire UP)

Below are online databases that allow readers to search county-level data for each of the past 30 days.

Overall score

Five MI Start regions in Michigan returned to level E in the state’s comprehensive risk assessment – the Detroit, Saginaw, Lansing, Kalamazoo, and Traverse City regions.

The Grand Rapids and Jackson areas are on level D and the Upper Peninsula is on level C.

In assigning risk scores, the Michigan Department of Health and Human Services examines factors such as new cases and deaths per capita, test positivity rates, number of tests administered, and visits to medical services. emergency for symptoms of COVID-19. The scale used by the MDHHS has six levels: “low” plus the AE levels.

(State MI Start Districts: Region 1 is Region Detroit; Region 2 is Grand Rapids; Region 3, Kalamazoo; Region 4, Saginaw; Region 5, Lansing; Region 6, Traverse City; Region 7, Jackson, and Region 8, the Upper Peninsula.)

Cases daily it was reported to the State

The first is a graph showing new cases reported to the state each day for the past 30 days. This is based on when a confirmed coronavirus test is reported to the state, which means the patient first became ill a few days ago.

You can call up a chart for any county and you can hover your cursor over a bar to see the date and number of cases.

(In a few cases, a county reported a negative (decrease) number of new daily cases, as a result of retroactive reclassification by the Michigan Department of Health and Human Services. In these cases, we subtracted the cases from the date previous and put 0 in the date of the report.)

The following graph below shows new cases over the past 30 days based on symptom onset. In this graph, the numbers for the most recent days are incomplete due to the delay between people getting sick and getting a confirmed coronavirus test result, which can take up to a week or more.

You can call up a chart for any county and you can hover your cursor over a bar to see the date and number of cases.

For more data on COVID-19 in Michigan, visit

Learn more about MLive:

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