The Manitowoc County Health Department is investigating seven cases of E. coli infection.

The county’s public health nurse manager, Amy Wergin, says they occurred between August 26th and September first, and involve people ranging in age from 8 to 66.

Wergin says that finding a source has been difficult because the cases are from different areas of the county. Her department is trying to determine if the infections came from a food source, such as a restaurant, or any place where people would be in contact with animals, such as a farm or petting zoo.