The Ohio Department of Health has scheduled a press conference to release the "preliminary-investigational report" disclosing what caused about 1,500 people to contract gastrointestinal illness last summer at Put-In-Bay Village Hall on South Bass Island.

Test results from stool and vomit samples taken from 15 people showed three types of infections: campylobacter, salmonella and norovirus. And OEPA tests produced traces of E coli bacteria in some of the wells.

ODH spokesman Jay Carey said the state has acted in a timely manner and knew from the onset the cause was more than likely a contamination of water drawn from wells on the island.