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More than 300 California runners have become sick with an unidentified virus following a mud run.
Tough Mudder athletes complain of rash after Sonoma County race
Tough Mudder Race in California Gets Even Tougher After Illness Spreads
Tough Mudder Coupon - Tough Mudder deal and reviews
Video Tough Mudder participants fall ill after California race - ABC News
Another Solid Reason Not to Do a Mud-Obstacle Run - The Atlantic
Hundreds of illnesses followed a Tough Mudder race in Sonoma County, California, officials estimate
Running News Daily Weekly Top Ten Stories - Top Ten Stories of the
Hundreds of 'Tough Mudder' Participants Suffer Rashes After Race in California
Several people fall ill with mysterious rashes, fever after Tough Mudder event - ABC News
Mysterious Rashes, Vomiting Plague Competitors in California Tough Mudder Challenge
Health advisory issued for participants of 'Tough Mudder' race