Yesterday Economic Opportunities MEC Alan Winde visited a farm in Paarl where a horse recently died from the disease.
The farm, and surrounding area, have been placed under quarantine.
About 70 horses in the region have been tested and have been found to be free of the virus.
State vet Gary Buhrmann says the European Union (EU) has placed a further two-year ban on horse exports after the last AHS outbreak in 2014, in Porterville.