07/27/2012 04:19 pm ET

Disney World Mystery Illness: 'Wild Africa Trek' Linked With More Than 30 Stomach Bug Cases

Health officials are trying to pinpoint the cause of a mysterious stomach bug-like illness affecting more than 30 people who visited Walt Disney World's "Wild Africa Trek" in Buena Vista, according to news reports.

"It appears to be some kind of stomach bug," Orange County Health Department spokesperson Dain Weister told the Orlando Sentinel. "It could be food-borne, it could be water-borne, it could be something that's passed on person-to-person, it could be something that's picked up by surface."

The illness includes symptoms of diarrhea, nausea, vomiting and abdominal pain, Medical Daily reported, though none of the symptoms were severe enough to require hospitalization.

Weister also told NBC News that health officials are questioning hundreds of people to see what could have caused the illness. People first started experiencing the symptoms at the beginning of June.

"Most people we have interviewed did not even go to the doctor," Weister told the Orlando Sentinel. "They thought, in some of these interviews, that it was a simple stomach bug, and they got better within two to five days."

The three-hour "Wild Africa Trek" costs $139 to $249 per head, Medical Daily reported, and concludes with a dinner. Bay News 9 reported that food inspectors investigated the area where the food was prepared but didn't find any violations.

"The inspection was satisfactory," Weister told Bay News 9.

NBC News reported that health officials have been unable to identify an exact pathogen based on stool samples. Norovirus is a common cause of food poisoning, but officials said that norovirus outbreaks usually cause more vomiting than was reported in this case, according to NBC News.

For more on the story, click over to the Orlando Sentinel.