State health officials say a virus has sickened people who participated in a long-distance race through mud and other obstacles in southern Michigan.
The Department of Community Health says there have been more than 200 reports of gastrointestinal problems from spectators and runners at last weekend's Tough Mudder event in Jackson County.
The department says it's norovirus, which produces flu-like symptoms for a few days. There is no specific remedy. Experts recommend fluids and rest.
Norovirus is common. The state says 119 suspected outbreaks have been reported in Michigan this year.