If you're participating in an obstacle race in the near future, you might want to make extra sure to keep your mouth closed during the mud-wading portion of the run. The Centers for Disease Control and Prevention released a report showing that 22 people got sick during a long-distance adventure obstacle course because they had inadvertently consumed water that had been contaminated with cow or pig feces. According to the report, three active-duty members of the military showed up to an emergency department in Nevada in October 2012 with symptoms of fever, bloody diarrhea and vomiting. After doctors interviewed them, they found that they had all participated in an obstacle adventure race on a cattle ranch, "in which competitors frequently fell face first into mud or had their heads submerged in surface water," the report said. The Nellis Air Force Base Public Health Flight investigated further, and found that 22 people overall -- including 18 probable cas...