Tough Mudder Race in California Gets Even Tougher After Illness Spreads

More than 300 California runners have become sick with an unidentified virus following a mud run.

Cross country championships: 'This is proper running', Running

Sonoma County investigating illnesses tied to 'Tough Mudder' race – NBC Bay Area

California Tough Mudder participants report bacterial infections

Hundreds at Tough Mudder race reportedly infected in Bay Area

Danger in the dirt

Danger in the dirt

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Sonoma County investigating illnesses tied to 'Tough Mudder' race – NBC Bay Area

California Tough Mudder participants report bacterial infections