Infection was circulating in a small geographical area despite the use of disease control measures.
The Five Star Beef feedlot in Ashburton, owned by ANZCO Foods, farms about 12,000 cattle
One farm in Ashburton remains with the disease.
The ministry is going back and taking a fresh look at some farms formerly infected with the cattle disease.
Eight workers sustained burns to hands, wrists, and arms in a 2018 incident.
More than 150,000 cattle have been killed in an attempt to rid the country of the disease.
Under current law they could end up with a hefty bill.
His Southland farm had earlier been declared disease-free.
