Mycoplasma bovis has been confirmed on two properties in Mid Canterbury and a further 25 properties are under a notice of direction.
''In essence 27 farms are under some form of regulatory control in Ashburton and there are 72 under active surveillance,'' Geoff Gwyn, of the Ministry for Primary Industries (MPI), told media after the Mid Canterbury Mycoplasma bovis Advisory Group meeting in Ashburton recently.
Those under active surveillance could be considered as ''part of due diligence or very low risk,'' he said.
There have been 24 properties in the area cleared of the disease.
In Mid Canterbury, 211 financial claims have been received, with 177 of those totalling more than $22.8million.