1,000 runners get sick with Norovirus after mud run in

It still isn't clear what caused the runners to become sick, but health officials are now testing ground samples taken from the race site to determine the cause of the illnesses.

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Tough Mudder participants were sickened by norovirus, Michigan Department of Community Health confirms

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More than 1,000 people were likely sickened by norovirus after French mud run - The Washington Post