Workers at Subway restaurants in Illinois linked to a salmonella outbreak must get tested for the bacteria before they can return to work.

Subway workers must get tested for salmonella

Workers in 46 Illinois Subways must have two consecutive negative test results for salmonella before being allowed to work again, according to a news release from the Illinois Department of Public Health.

The number of people contaminated, meanwhile, continues to grow. As of June 21, 97 have reported becoming sick, according to the department.

Despite advising Subway that fresh produce is suspected in the outbreak, the department had yet to establish a definite link as of June 21.

The department is being assisted in its investigation with local health departments, the Food and Drug Administration, the Centers for Disease Control and Prevention and Subway Corp.

After diners began reporting illnesses, Subway replaced lettuce, green peppers, red onions and tomatoes from restaurants in 26 Illinois counties.

The latest date reported for hospitalization was May 30. The ages of those sickened range from 2 to 79.