Michigan now has 37 of its 83 counties with a positivity rate over 10% as a seven-day average on coronavirus diagnostic tests. That number has more than doubled in the past week.

Fourteen of those counties are over 15% and six — including Lapeer and St. Clare — are now over 20%.

6 reasons that Michigan’s COVID-19 numbers are surging

Statewide, the seven-day positivity rate on coronavirus diagnostic tests has gone from 6.4% to 9.6% in the past week. The one-day rate was 9.8% for test results reported on Thursday.

Below is a closer 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 the state’s metric.

  • Level E (over 20%): Huron, St. Clair, Missaukee, Oscoda, Lapeer and Otsego,
  • Level D (15-20%), eight counties: Wexford, Sanilac, Roscommon, Tuscola, Macomb, Crawford, Hillsdale and Presque Isle.
  • Level C (10-15%), 23 counties highest to lowest: Osceola, Van Buren, Genesee, Cheboygan, Allegan, Jackson, Eaton, Kalkaska, Ontonagon, Kalamazoo, Barry, St Joseph, Livingston, Antrim, Wayne, Shiawassee, Ottawa, Ingham, Oakland, Branch, Clinton, Calhoun and Oceana.
  • Level B (7-10%): 19 counties, highest to lowest: Cass, Bay, Monroe, Berrien, Montcalm, Muskegon, Newaygo, Alcona, Saginaw, Grand Traverse, Midland, Leelanau, Kent, Mecosta, Gladwin, Lake, Lenawee, Benzie and Keweenaw.
  • Level A (3-7%): 18 counties, highest to lowest: Alpena, Isabella, Houghton, Arenac, Montmorency, Mason, Clare, Emmet, Manistee, Ionia, Charlevoix, Iosco, Mackinac, Ogemaw, Dickinson, Gogebic, Delta and Luce.
  • Low (under 3%): Nine counties, highest to lowest: Washtenaw, Chippewa, Gratiot, Marquette, Schoolcraft, Iron, Alger, Menominee and Baraga.

The chart below allows you to look up any county by name to see the seven-day average positivity rate for March 18-24. The chart compares the average from the past seven days to the average for the previous week.

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

New cases per capita

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

This metric calculates the average number of new cases per 1 million residents.

The levels for each county:

  • Level E (Over 150 cases per million): 66 counties, highest to lowest: Huron, Sanilac, St. Clair, Otsego, Wexford, Missaukee, Lapeer, Macomb, Jackson, Roscommon, Tuscola, Osceola, Crawford, Oakland, Wayne, Livingston, Antrim, Eaton, Ingham, Cass, Calhoun, Genesee, Cheboygan, Kalkaska, Shiawassee, Montcalm, Ottawa, Presque Isle, Allegan, Monroe, Bay, Midland, Oscoda, Berrien, Van Buren, Kalamazoo, Clinton, Newaygo, Hillsdale, Barry, Branch, Kent, Saginaw, Gladwin, Houghton, Leelanau, Chippewa, Lake, Grand Traverse, Keweenaw, Lenawee, Washtenaw, Emmet, Alcona, Ionia, St. Joseph, Ontonagon, Mason, Mecosta, Iosco, Isabella, Oceana, Charlevoix, Benzie and Alpena.
  • Level D (70 to 149 cases per million): 14 counties: Muskegon, Mackinac, Manistee, Montmorency, Gratiot, Delta, Marquette, Clare, Arenac, Gogebic, Dickinson, Ogemaw, Schoolcraft and Baraga.
  • Level C (40 to 69 cases per million): Alger, Menominee and Luce.
  • Level B (20 to 40 cases per million): Iron.
  • Level A (7 to 20 cases per million): None.
  • Low (Below 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 per capita number that adjusts for population. The arrows indicate whether the total number of new cases reported in the last seven days has gone up or down compared to the previous seven days.

The current scores are based on new cases reported March 19-25. The map below is shaded based on the state’s six levels. The arrows indicate whether the total number of new cases reported in the last seven days has gone up or down compared to March 12-18.

Readers can put their cursor over a county to see the underlying data. (Hint: You can drag the map with your cursor to see the entire U.P.)

Below are online databases that allow readers to look up county-level data for each of the last 30 days.

Overall score

Five Michigan’s MI Start regions are back up to Level E in the state’s overall risk assessment — the Detroit, Saginaw, Lansing, Kalamazoo and Traverse City regions.

The Grand Rapids and Jackson regions are at Level D and the Upper Peninsula is at Level C.

In assigning the risk scores, Michigan Department of Health and Human Services looks at factors such as new cases and deaths per capita, test positivity rates, number of tests administered and emergency department visits for COVID-19 symptoms. The scale used by MDHHS has six levels — “low” plus Levels A-E.

(The state’s MI Start districts: Region 1 is the Detroit region; 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 by day it was reported to the state

First is a chart 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 sick days before.

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

(In a few instances, a county reported a negative number (decline) in daily new cases, following a retroactive reclassification by the Michigan Department of Health and Human Services. In those instances, we subtracted cases from the prior date and put 0 in the reported date.)

The next chart below shows new cases for the past 30 days based on onset of symptoms. In this chart, numbers for the most recent days are incomplete because of the lag time 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 put your cursor over a bar to see the date and number of cases.

For more data on COVID-19 in Michigan, visit https://www.mlive.com/coronavirus/data/.

Read more on MLive:

6 reasons that Michigan’s COVID-19 numbers are surging

How to find a COVID-19 vaccination appointment in Michigan

Pharmacies help ramp up coronavirus vaccines in Michigan



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