(WSFA) — GATLINBURG, TN – E. coli was found in water at a zipline attraction after nearly 550 visitors to the attraction reported illness, and authorities think the estimate may be low.

Initials tests confirmed the presence of E. coli and other bacteria in a well water sample at Climb Works Zip Line Canopy Tour, health officials told the Knoxville News Sentinel.

People who became ill drank water served out of coolers along the course, WVLT reported.

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