Wisconsin state and Green County officials are trying to track down the source of an E. coli outbreak that has claimed the life of a 1-year-old girl and has sickened several others.

“The Wisconsin Division of Public Health and our department here in Green County are investigating a cluster of nine confirmed E. coli O157:H7 infections,” said RoAnn Warden, director of the Green County Health Department.

All of those sickened are from Green County, although Warden said they have been geographically spread out, with some in the outlying portions of the county. Some households have had multiple cases.

Sources have told The Cap Times that a 20-month-old girl from Green County died Sunday at UW Children’s Hospital in Madison after being admitted about a week earlier.