Wyo. Stat. § 11-19-402: Breeding cattle and bison entering state to show evidence of negative test or vaccination for brucellosis; exceptions.

All breeding cattle and bison entering Wyoming shall be accompanied by a proper health certificate showing evidence of a negative blood test for brucellosis made within thirty (30) days prior to entry, or evidence of being officially vaccinated by a licensed veterinarian during calfhood against brucellosis. Breeding cattle and bison originating from brucellosis free areas and from certified brucellosis free herds entering Wyoming may be exempt from this section but must be accompanied by a proper health certificate.