According to the Illinois Department of Health:

Age range of confirmed cases: 2 to 79.

Cases have reported eating at Subway restaurants located in 26 counties — Bureau, Cass, Champaign, Christian, Coles, Dekalb, DeWitt, Fulton, Henry, Knox, LaSalle, Livingston, Macon, Marshall, McLean, Moultrie, Ogle, Peoria, Sangamon, Schuyler, Shelby, Tazewell, Vermilion, Warren, Will and Winnebago.

Investigation is ongoing. Numbers will be updated June 16, if additional cases are identified.