The Maitland Fire Rescue treated about 40 people Wednesday in a possible case of food poisoning at an office building, officials said.

Deputy Fire Chief Will Watts said the office was having a “large catered event” when the employees started getting sick around 3:30 p.m. More than 15 people were hospitalized and were listed in stable condition.

“There’s a significant number of patients that have symptoms that are consistent with a stomach illness,” Watts said.

Dain Weister, a spokesman for the Florida Department of Health, said people were vomiting and had diarrhea.

“It’s a pretty big outbreak to have so many people become sick in one location,” he said. “It’s not too often that we have so many people sick.”