510 ILCS 35/11

No tuberculin test is required for cattle or bison brought into the State of Illinois or shipped from public stockyards in the State, or exhibited in the State, when such cattle or bison are accompanied by a certificate of health issued by an accredited veterinarian or a veterinarian employed by the United States Department of Agriculture. Such cattle or bison may be subject to a negative tuberculin test or quarantine for tuberculosis as provided in Section 12.6 of the Act and regulations promulgated thereto.