Health types are investigating a cluster of seven E. coli cases in Livingston County, New York, up near Buffalo.

No deaths were reported, although four people were hospitalized. Two have since been discharged, according to health director Joan Ellison.

“We are gathering information and looking at all possibilities of the source,” Ellison said. “We have nothing concrete to say it’s ‘this’ or ‘that.’ ”

Stool samples were sent to the state Department of Health lab in Albany to determine the exact strain of E. coli.