The number of people diagnosed with the coronavirus COVID-19 in Michigan took another big jump, reaching 2,295 on Wednesday, March 25, up from 1,791 the day before.

That includes more than 1,100 cases in Wayne County.

The number of Michigan coronavirus cases has more than doubled in four days, although health officials say that’s partly due to an significant increase in testing.

Forty-three people have died, according to the state’s daily update on coronavirus numbers. That’s up from 24 on Tuesday.

The Michigan Department of Health and Human Services reported 507 new cases on its daily update, setting another record for a one-day increase.

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The numbers have spiked since last week, when the state began to significantly increase the number of people tested for the coronavirus.

“Originally, you only had the state Bureau of Laboratories doing the testing,” said Linda Vail, Ingham County’s health officer. Last week, some hospitals and private laboratories began performing tests, and those results are now showing up, "and a lot of these test results are now getting dumped into the system,” she said.

Forty-eight of Michigan’s 83 counties are home to a resident who contracted coronavirus.

Abou t89% of the COVID-19 cases -- 2,046 of 2,295 -- are in Wayne, Oakland and Macomb counties.

The disproportionate number of cases in metro Detroit is a result of several factors, including the area’s large population, more aggressive testing in those counties and community spread of coronavirus, said Lynn Sutfin, spokeswoman for the Michigan Department of Health and Human Services. About 39% of Michigan residents live in Wayne, Oakland or Macomb counties.

There are 705 patients who are Detroit residents; 417 who live elsewhere in Wayne County; 543 who live in Oakland County and 281 in Macomb County.

Of the 43 patients who died, 12 were residents of Detroit, nine in Wayne County outside of Detroit, 10 in Oakland County, seven in Macomb, three in Washtenaw and one each in Kent and Livingston counties.

Whitmer declared a state of emergency on March 10 after the first cases were identified. She has since closed schools, bars, restaurants and other establishments to prevent COVID-19 from spreading further.

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On Monday, March 23, Whitmer issued a “stay-at-home” order, requiring Michigan residents to stay at home except for essential business.

There have been nearly 55,000 cases of the coronavirus and 400 deaths in the United States, according to the Center for Disease Control.

Every state in the country has reported a COVID-19 case. States with the highest number of cases include Washington, New York, California, New Jersey and Louisiana.

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Coronavirus symptoms include fever, cough and shortness of breath. Many infected people exhibit mild symptoms and don’t necessarily need to be tested or treated in-person, as there’s currently no known vaccine or cure for the disease.

Read all of MLive’s coverage on the coronavirus at mlive.com/coronavirus.

Additional information is available at Michigan.gov/Coronavirus and CDC.gov/Coronavirus.

CORONAVIRUS PREVENTION TIPS

In addition to washing hands regularly and not touching your face, officials recommend practicing social distancing, assuming anyone may be carrying the virus. Health officials say you should be staying at least 6 feet away from others and working from home, if possible. Carry hand sanitizer with you, and use disinfecting wipes or disinfecting spray cleaners on frequently-touched surfaces in your home ( door handles, faucets, countertops ) and when you go into places like stores.