S.C. Code Ann. § 47-13-580

No female cattle or breeding bulls more than six months of age shall be sold or moved except for slaughter, unless such cattle either (a) have been tested for brucellosis and found negative within thirty days prior to the date of sale, (b) are dairy cattle and breeding cattle under thirty months of age and were vaccinated against brucellosis with an approved vaccine when they were not less than four months nor more than twelve months of age and were identified as provided under rules and regulations promulgated by the State Livestock-Poultry Health Commission and reported at the time of vaccination to State and Federal cooperating agencies or (c) are in brucellosis-free accredited herds or areas at the time of sale.