An outbreak of salmonella illnesses in Illinois has grown. Health officials now report 48 cases.

The cases are linked to Subway restaurants in 18 Illinois counties, including Will County. That was the first county in the Chicago area to report an illness. There are two confirmed cases there.

People who ate at the restaurants got sick between May 11 and May 25. Seventeen people were hospitalized. All are recovering. The public health department is still trying to determine which specific source caused the outbreak.