More than 300 California runners have become sick with an unidentified virus following a mud run.
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Tough Mudder racers report rash, illness after Sonoma event
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What Happened at Tough Mudder Sonoma: Hundreds Get Sick With Possible Bacterial Infection
Mystery outbreak in California sees 'hundreds' of people break out in rashes and suffer vomiting after competing in Tough Mudder event
