Dirty hydrant water theory flushed; unlikely source of Vegas marathon outbreak

Health officials told Associated Press tainted water doesn’t seem to be the cause behind hundreds of reports of gastrointestinal illness following the Rock ‘n’ Roll Las Vegas Marathon.

Southern Nevada Health District epidemiologists say preliminary results of their investigation released Thursday are "largely inconsistent" with the hypothesis that hydrant water passed out during the race sickened runners.

Authorities say no cause for the illness has been determined.