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

An outbreak of illnesses after a Tough Mudder race in Sonoma County, California, this month has reached about 300 cases, the county estimated Wednesday.

The Sonoma County Department of Health Services issued a health advisory last week after reports of rash, f...

The Tough Mudder race involved extensive skin exposure to mud. Most affected persons have pustular rash, fever, myalgias, and headache.

As of Monday morning, Sonoma County health officials still don’t know the full extent of a bacterial infection that plagued participants of the Tough Mudder obstacle course at Sonoma Raceway on Aug. 19 and 20.

California health officials have issued an advisory after several people who participated in a Tough Mudder race last weekend got sick. Nearly two dozen people who ran in the Tough Mudder challenge at Sonoma Raceway on August 19 and 20 developed rashes with fever and reported muscle pain or nausea and vomiting, according to the

More than 100 people said they got bacterial infections after a Tough Mudder event in Sonoma, California. Symptoms included rashes, fever, muscle pain and vomiting.

Nearly two dozen people who participated in a Tough Mudder challenge developed rashes and fever after the event last weekend, Sonoma County health officials said.

Sonoma County's health department has issued an advisory for anyone who competed in the Tough Mudder endurance event in California

After participating in a recent Tough Mudder obstacle course challenge, at least 22 people have reported developing odd rashes and fevers.