225 ILCS 650/8
The licensee of a Type I establishment shall require all employees in his establishment to meet the health requirements established by the Illinois Department of Public Health. The Director may at any time require an employee of an establishment to submit to a health examination by a physician. No person suffering from any communicable disease, including any communicable skin disease, and no person with infected wounds, and no person who is a "carrier" of a communicable disease shall work in any capacity in an establishment. No person shall work or be employed in or about any establishment during the time in which a communicable disease exists in the home in which such person resides unless such person has obtained a certificate from the state or local health authority to the effect that no danger of public contagion or infection or adulteration of product will result from the employment of such person in such establishment.
225 ILCS 650/8