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.

Another Solid Reason Not to Do a Mud-Obstacle Run - The Atlantic

What Happened at Tough Mudder Sonoma: Hundreds Get Sick With Possible Bacterial Infection

Tough Mudder competitors contract fatal bacterial infection after race - US News - News - Daily Express US

Races & Places Runner's World

What Happened at Tough Mudder Sonoma: Hundreds Get Sick With Possible Bacterial Infection

She competed in Tough Mudder; pustular rash was her prize - Los Angeles Times

Sonoma County Public Health officials launch investigation into possible bacterial infections after Tough Mudder endurance race

Sonoma County Tough Mudder Event — Where Some Claimed to Smell 'Cow Manure' on Field — Sickens Hundreds

Mysterious Rashes, Vomiting Plague Competitors in California Tough Mudder Challenge

Tough Mudder athletes complain of rash after Sonoma County race