by the Animal and Plant Health Inspection Service, United States Department of Agriculture, Quarantine and health requirements of the People's Republic of China for swine exported from the… (1995)
“ The animals to be exported shall originate from farms in which:5.1 The premises of origin are free of pseudorabies. If pseudorabies has occurred on the farm of origin, all the pigs must have been killed and the facilities shall have been disinfected with an effective disinfectant. All new pigs must come from farms which are free from pseudorabies, and must be reared on the farm for 2 years prior to export to China. ”
