1,000 runners get sick with Norovirus after mud run in southeastern French - ABC7 Los Angeles

It still isn't clear what caused the runners to become sick, but health officials are now testing ground samples taken from the race site to determine the cause of the illnesses.

Tough Mudder racers at MIS contracted norovirus from sick participant, health officials say

Tough Mudder racers at MIS contracted norovirus from sick participant, health officials say

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

What to know about the symptoms and treatment of norovirus as it spreads across the US - ABC News

Tough Mudder racers at MIS contracted norovirus from sick participant, health officials say

Tough Mudder racers at MIS contracted norovirus from sick participant, health officials say

The Rambling Runner Podcast

Director's Reports Lamont-Doherty Earth Observatory

Tough Mudder Race in California Gets Even Tougher After Illness Spreads

What to know about the symptoms and treatment of norovirus as it spreads across the US - ABC News