The state of Michigan now has 12 “presumptive positive” cases of coronavirus, the Michigan Department of Health and Human Services and local health departments announced Thursday night.

The additional cases include:

• An adult female from Ingham County with history of travel on a cruise.

• Two adult females from Kent County and one adult male, all with history of international travel.

• An adult female from Montcalm with history of international travel.

• Two adult males from Oakland County; one with no travel history and one with domestic travel.

• An adult male from St. Clair County with history of domestic travel.

• One adult female and one adult male from Washtenaw County; one with history of domestic travel and one with history of international travel. According to the Washtenaw County Healthy Department, one traveled to Europe and the other to New York.

The cases above join two presumptive positive tests announced on Tuesday night -- one from Oakland and one from Wayne County -- and one additional presumptive positive test from St. Clair County announced earlier Thursday evening.

Coronavirus symptoms may appear in as few as two days or as long as 14 days after exposure to the virus. They include fever, cough and shortness of breath. For most, the symptoms are mild, but it poses serious danger to others.

According to the U.S. Centers for Disease Control and Prevention, the virus has sickened 1,215 people and resulted in 36 deaths, nationally.

Related: Here’s the list of specific coronavirus precautions urged by Michigan health officials

According to the state website, there are now 26 pending test results and 172 people being monitored.

Gov. Gretchen Whitmer declared a state of emergency and issued recommendations to control the spread of the virus, including avoiding gatherings of 100 or more people, staying home when sick and practicing good hygiene.

Public universities and some private colleges have canceled classes.

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PREVENTION TIPS

Michigan’s State Emergency Operations Center is coordinating state-government resources and the response to the coronavirus spread. It has shared the following tips:

What you can do to prevent the spread of COVID-19 and other respiratory diseases:

For statewide and national information on the virus, visit Michigan.gov/Coronavirus or CDC.gov/Coronavirus.

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