According to Milwaukee AP, Wisconsin Woman Tests Positive For E. Coli Infection, an 18-year-old Milwaukee County woman tested positive for the same strain of bacteria that sickened four Minnesota children last week, the state Department of Health and Family Services said Monday. The E. coli strain, O157:H7, is identical to the one linked to ground-beef patties produced in Wisconsin by Cargill Inc. and sold at three Sam’s Club stores in the Twin Cities area, the health agency said in a statement.