DETROIT (AP) — Officials say Michigan has its first confirmed case this year of a mysterious paralyzing illness called acute flaccid myelitis.

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The Michigan Department of Health and Human Services announced Wednesday that it was notified by the Centers for Disease Control and Prevention that the state has a confirmed case in a child in Wayne County, which includes Detroit and some suburbs. Seven suspected cases in Michigan are under investigation.

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Officials have said this year’s count nationally could surpass the tallies seen in similar outbreaks in 2014 and 2016.

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It’s not clear what’s causing some children to lose the ability to move their face, neck, back, arms or legs. The symptoms tend to occur about a week after the children had a fever and respiratory illness.

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