An investigation continues into what has caused hundreds of visitors to a Tennessee zipline destination to suddenly develop gastrointestinal illness.
More than 500 people have reported symptoms including stomachache, nausea and vomiting after visiting the CLIMB Works Zipline Canopy Tour in Gatlinburg. The Tennessee Department of Health announced Thursday that officials are continuing to look for the cause of the illnesses.
"At this time, we cannot point to one simple cause of this outbreak," John Dunn, the department's deputy state epidemiologist, said in the news release about the investigation.
Since June, several visitors to the CLIMB Works facility tested positive for the common stomach bug norovirus, according to the department. Norovirus causes acute gastroenteritis, or inflammation of the stomach or intestines. Symptoms, which typically last one to three days, include diarrhea, vomiting, nausea and stomach pain.
One patient tested positive for both norovirus and enteropathogenic E. coli, a diarrheal pathogen, according to the department. Symptoms of E. coli infection may last several days.
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